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  <xsd:element abstract="true" id="pkg_DisclosureUnrecognizedCompensationExpenseforShareBasedAwardsAbstract" name="DisclosureUnrecognizedCompensationExpenseforShareBasedAwardsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_DiversifiedEmergingMarketsCommonCollectiveTrustFundsMember" name="DiversifiedEmergingMarketsCommonCollectiveTrustFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_DiversifiedEmergingMarketsMutualFundsMember" name="DiversifiedEmergingMarketsMutualFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_EarningsPerShareLineItems" name="EarningsPerShareLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_EmployeeAgeAfterWhichMinimumServicePeriodToBeCompletedForRetireeMedicalBenefitPlanCoverage" name="EmployeeAgeAfterWhichMinimumServicePeriodToBeCompletedForRetireeMedicalBenefitPlanCoverage" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_EmployeeStockOwnershipPlanMember" name="EmployeeStockOwnershipPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_EnvironmentalContingenciesMember" name="EnvironmentalContingenciesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_EnvironmentalLiabilityTypeAxis" name="EnvironmentalLiabilityTypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_EnvironmentalLiabilityTypeDomain" name="EnvironmentalLiabilityTypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_EnvironmentalRemediationExpenseToDate" name="EnvironmentalRemediationExpenseToDate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pkg_ExpensesRelatedToAlternativeEnergyTaxCredits" name="ExpensesRelatedToAlternativeEnergyTaxCredits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_FairValueMeasurementsOfPlanAssetsTable" name="FairValueMeasurementsOfPlanAssetsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_FiberMember" name="FiberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_FiberSupplyAxis" name="FiberSupplyAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_FiberSupplyDomain" name="FiberSupplyDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_FiveYearandSevenYearTermLoansdueOctober2018and2020respectivelyMember" name="FiveYearandSevenYearTermLoansdueOctober2018and2020respectivelyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_FixedIncomeCommonCollectiveTrustFundsMember" name="FixedIncomeCommonCollectiveTrustFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ForeignLargeBlendCommonCollectiveTrustFundsMember" name="ForeignLargeBlendCommonCollectiveTrustFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ForeignLargeBlendMutualFundsMember" name="ForeignLargeBlendMutualFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ForeignOperationsMember" name="ForeignOperationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_HealthCareCostTrendRatesAssumptionsLineItems" name="HealthCareCostTrendRatesAssumptionsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_HealthCareCostTrendRatesAssumptionsTable" name="HealthCareCostTrendRatesAssumptionsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_HighStockPricePerShare" name="HighStockPricePerShare" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_IncludedinIncomeFromOperationsMember" name="IncludedinIncomeFromOperationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_IncomeTaxCreditsAndAdjustmentsAxis" name="IncomeTaxCreditsAndAdjustmentsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_IncomeTaxCreditsAndAdjustmentsDomain" name="IncomeTaxCreditsAndAdjustmentsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_IncomeTaxUncertaintiesLineItems" name="IncomeTaxUncertaintiesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_IncomeTaxUncertaintiesTable" name="IncomeTaxUncertaintiesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_IncreaseDecreaseDuringPeriodReserveForUncertainTaxPositions" name="IncreaseDecreaseDuringPeriodReserveForUncertainTaxPositions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_IndefiniteMember" name="IndefiniteMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_IntegrationRelatedandOtherCostsMember" name="IntegrationRelatedandOtherCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_InterestPaymentsandRedemptionPremiumPayments" name="InterestPaymentsandRedemptionPremiumPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_InternationalEquitySecuritiesMember" name="InternationalEquitySecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_InventoryAmountValuedAtLIFO" name="InventoryAmountValuedAtLIFO" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pkg_InvestmentCommitment" name="InvestmentCommitment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_LargeCapUSEquitySecuritiesMember" name="LargeCapUSEquitySecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_LeaseTermPeriod" name="LeaseTermPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_LeaseTypeAxis" name="LeaseTypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_LeaseTypeDomain" name="LeaseTypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_LongTermDebtApplicableMargin" name="LongTermDebtApplicableMargin" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_LongTermDebtExcludingCurrentPortionMember" name="LongTermDebtExcludingCurrentPortionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_LongTermEquityIncentivePlanTerminationDate" name="LongTermEquityIncentivePlanTerminationDate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:normalizedStringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_LongTermPurchaseCommitmentAmountDueThereafter" name="LongTermPurchaseCommitmentAmountDueThereafter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pkg_LongTermPurchaseCommitmentAmountDueWithinFiveYears" name="LongTermPurchaseCommitmentAmountDueWithinFiveYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pkg_LongTermPurchaseCommitmentAmountDueWithinFourYears" name="LongTermPurchaseCommitmentAmountDueWithinFourYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pkg_LongTermPurchaseCommitmentAmountDueWithinOneYear" name="LongTermPurchaseCommitmentAmountDueWithinOneYear" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pkg_LongTermPurchaseCommitmentAmountDueWithinThreeYears" name="LongTermPurchaseCommitmentAmountDueWithinThreeYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pkg_LongTermPurchaseCommitmentAmountDueWithinTwoYears" name="LongTermPurchaseCommitmentAmountDueWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pkg_LongTermPurchaseCommitmentFutureMinimumPaymentsDue" name="LongTermPurchaseCommitmentFutureMinimumPaymentsDue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pkg_LossOnForeignCurrencyCashFlowHedgeDerivatives" name="LossOnForeignCurrencyCashFlowHedgeDerivatives" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pkg_LowStockPricePerShare" name="LowStockPricePerShare" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_MarketPulpMember" name="MarketPulpMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_MatchingContributionsMember" name="MatchingContributionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_MedicalBenefitsReservesMember" name="MedicalBenefitsReservesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_MinimumRetirementAgeForRetireeMedicalBenefitPlanCoverage" name="MinimumRetirementAgeForRetireeMedicalBenefitPlanCoverage" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_MinimumServicePeriodForRetireeMedicalBenefitPlanCoverage" name="MinimumServicePeriodForRetireeMedicalBenefitPlanCoverage" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_NetOperatingLossCarryforwardsMember" name="NetOperatingLossCarryforwardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_NewDebtInstruments" name="NewDebtInstruments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_NonCashPensionCurtailmentChargeMember" name="NonCashPensionCurtailmentChargeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_NonrecurringAcquisitionRelatedCostsMember" name="NonrecurringAcquisitionRelatedCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_NonrecurringActivityAxis" name="NonrecurringActivityAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_NonrecurringActivityDomain" name="NonrecurringActivityDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_NumberOfSharesAvailableForFutureIssuanceUnderShareBasedPaymentPlan" name="NumberOfSharesAvailableForFutureIssuanceUnderShareBasedPaymentPlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pkg_NumberofEmployeesContinuingtoAccruePensionBenefits" name="NumberofEmployeesContinuingtoAccruePensionBenefits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_OfficeDepotincludingOfficeMaxMember" name="OfficeDepotincludingOfficeMaxMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_OperatingLeasesMember" name="OperatingLeasesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_OperatingLossCarryforwardsStateTaxingJurisdiction" name="OperatingLossCarryforwardsStateTaxingJurisdiction" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pkg_OperatingLossCarryforwardsUsFederalAndNonUs" name="OperatingLossCarryforwardsUsFederalAndNonUs" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pkg_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostAndNetLossRecognizedInNetPeriodicPensionCostNetOfTax" name="OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostAndNetLossRecognizedInNetPeriodicPensionCostNetOfTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pkg_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostAndNetLossRecognizedInNetPeriodicPensionCostTax" name="OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostAndNetLossRecognizedInNetPeriodicPensionCostTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pkg_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossAndNetPriorServiceCostsArisingDuringPeriodNetOfTax" name="OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossAndNetPriorServiceCostsArisingDuringPeriodNetOfTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pkg_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossAndNetPriorServiceCostsArisingDuringPeriodTax" name="OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossAndNetPriorServiceCostsArisingDuringPeriodTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_OtherDebtRefinancingChargesMember" name="OtherDebtRefinancingChargesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_OtherExpenseNetAbstract" name="OtherExpenseNetAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_OtherLongTermAssetsMember" name="OtherLongTermAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_OtherLongTermLiabilitiesMember" name="OtherLongTermLiabilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_OtherSecuritiesMember" name="OtherSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_PackagingCorporationofAmericaMember" name="PackagingCorporationofAmericaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_PackagingMember" name="PackagingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_PackagingSpecialistsMember" name="PackagingSpecialistsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_PaperMember" name="PaperMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_PensionAndPostretirementBenefitsContributionsExpenseNet" name="PensionAndPostretirementBenefitsContributionsExpenseNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pkg_PercentageOfCustomerReturnsAllowancesAndEarnedDiscountsToGrossSellingPrice" name="PercentageOfCustomerReturnsAllowancesAndEarnedDiscountsToGrossSellingPrice" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_PercentageOfHourlyEmployeesRepresentedByUnions" name="PercentageOfHourlyEmployeesRepresentedByUnions" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_PerformanceUnitsMember" name="PerformanceUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_Pkg_GovernmentGrantsTextBlockTextBlock" name="Pkg_GovernmentGrantsTextBlockTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_PlantClosureAndOtherMember" name="PlantClosureAndOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_ProceedsFromGovernmentGrant" name="ProceedsFromGovernmentGrant" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pkg_PropertyPlantandEquipmentEstimatedUsefulLivesTableTextBlock" name="PropertyPlantandEquipmentEstimatedUsefulLivesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_QuarterlyFinancialDataLineItems" name="QuarterlyFinancialDataLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_QuarterlyFinancialInformationQuarterlyChargesAndCreditsAmountPerDilutedShareAffectingComparability" name="QuarterlyFinancialInformationQuarterlyChargesAndCreditsAmountPerDilutedShareAffectingComparability" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_RealestatesecuritiesMember" name="RealestatesecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ReceivablesAndAccrualsNetMember" name="ReceivablesAndAccrualsNetMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ReceivablesCreditFacilityMember" name="ReceivablesCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeAbstract" name="ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ReconciliationOfEffectiveIncomeTaxRateTable" name="ReconciliationOfEffectiveIncomeTaxRateTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_RedemptionPremiumMember" name="RedemptionPremiumMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_RedemptionPremiumonLongTermDebt" name="RedemptionPremiumonLongTermDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pkg_ReferenceInterestRate" name="ReferenceInterestRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_RelatedPartyTransactionsByTransactionTypeAxis" name="RelatedPartyTransactionsByTransactionTypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_ReserveForCustomerDeductions" name="ReserveForCustomerDeductions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pkg_ReservePercentageForCustomerDeductions" name="ReservePercentageForCustomerDeductions" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfAccruedLiabilitiesLineItems" name="ScheduleOfAccruedLiabilitiesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfAccruedLiabilitiesTable" name="ScheduleOfAccruedLiabilitiesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfCommitmentsAndContingenciesLineItems" name="ScheduleOfCommitmentsAndContingenciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfCommitmentsAndContingenciesTable" name="ScheduleOfCommitmentsAndContingenciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfDeferredTaxAssetsAndLiabilitiesLineItems" name="ScheduleOfDeferredTaxAssetsAndLiabilitiesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfDeferredTaxAssetsAndLiabilitiesTable" name="ScheduleOfDeferredTaxAssetsAndLiabilitiesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfEffectiveTaxRatesLineItems" name="ScheduleOfEffectiveTaxRatesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfIncomeTaxesTable" name="ScheduleOfIncomeTaxesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfInventoryLineItems" name="ScheduleOfInventoryLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfInventoryTable" name="ScheduleOfInventoryTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_ScheduleOfLineOfCreditInterestRatesTableTextBlock" name="ScheduleOfLineOfCreditInterestRatesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_ScheduleOfNetBenefitCostsAndAmountsRecognizedOtherComprehensiveIncomeLossTableTextBlock" name="ScheduleOfNetBenefitCostsAndAmountsRecognizedOtherComprehensiveIncomeLossTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfPensionExpectedFutureBenefitPaymentsTable" name="ScheduleOfPensionExpectedFutureBenefitPaymentsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfQuarterlyFinancialDataTable" name="ScheduleOfQuarterlyFinancialDataTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ScheduleOfWeightedAverageAssumptionsTable" name="ScheduleOfWeightedAverageAssumptionsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_SeniorCreditFacilityMember" name="SeniorCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_SeniorNotesFivePointSevenFivePercentageSeniorNotesMember" name="SeniorNotesFivePointSevenFivePercentageSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember" name="SeniorNotesSixPointFivePercentageSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember" name="SeniorNotesThreePointNinePercentageSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ServiceRelatedContributionsMember" name="ServiceRelatedContributionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ShareRepurchaseProgramAbstract" name="ShareRepurchaseProgramAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_ShareRepurchaseProgramTable" name="ShareRepurchaseProgramTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_ShareRepurchaseProgramTableTextBlock" name="ShareRepurchaseProgramTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_SignificantAccountingPoliciesLineItems" name="SignificantAccountingPoliciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_SignificantAccountingPoliciesTable" name="SignificantAccountingPoliciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_SmallAndMidCapUsEquitySecuritiesMember" name="SmallAndMidCapUsEquitySecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_StateTaxesAndOthersMember" name="StateTaxesAndOthersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_StockRepurchaseProgramLineItems" name="StockRepurchaseProgramLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_TaxCreditCarryforwardUsFederalNonUsAndState" name="TaxCreditCarryforwardUsFederalNonUsAndState" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pkg_TaxCreditPerGallon" name="TaxCreditPerGallon" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_TaxRelatedtoCellulosicBiofuelTaxCreditsMember" name="TaxRelatedtoCellulosicBiofuelTaxCreditsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_TermOfSeniorCreditFacilitiesAndNotes" name="TermOfSeniorCreditFacilitiesAndNotes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:positiveIntegerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TermloanDueOctober2018Member" name="TermloanDueOctober2018Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TermloanDueOctober2020Member" name="TermloanDueOctober2020Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_TotalRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLoss" name="TotalRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TotalSecuritiesAtFairValueMember" name="TotalSecuritiesAtFairValueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_TradeAgreementsPolicyTextBlock" name="TradeAgreementsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TwoThousandAndEightInterestRateProtectionAgreementMember" name="TwoThousandAndEightInterestRateProtectionAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TwoThousandAndElevenInterestRateProtectionAgreementMember" name="TwoThousandAndElevenInterestRateProtectionAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TwoThousandAndTenInterestRateProtectionAgreementMember" name="TwoThousandAndTenInterestRateProtectionAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TwoThousandAndThreeInterestRateProtectionAgreementMember" name="TwoThousandAndThreeInterestRateProtectionAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TypeofCostAxis" name="TypeofCostAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_TypeofCostDomain" name="TypeofCostDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_USEquitySecuritiesMember" name="USEquitySecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_USTreasuryNoteMaturityTerm" name="USTreasuryNoteMaturityTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_UnfundedPortionofInvestmentCommitment" name="UnfundedPortionofInvestmentCommitment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_UnitedStatesLargeGrowthMember" name="UnitedStatesLargeGrowthMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_UnitedStatesLargeValueMember" name="UnitedStatesLargeValueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_UnitedStatesMidCapGrowthMember" name="UnitedStatesMidCapGrowthMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_UnitedStatesMidCapValueMember" name="UnitedStatesMidCapValueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_UnitedStatesSmallBlendMember" name="UnitedStatesSmallBlendMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_UnitedStatesTreasuryGrantLineItems" name="UnitedStatesTreasuryGrantLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_UnitedStatesTreasuryGrantTable" name="UnitedStatesTreasuryGrantTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pkg_UnrecognizedTaxBenefitAccrualForPenalties" name="UnrecognizedTaxBenefitAccrualForPenalties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pkg_UsFederalCapitalLossCarryforwards" name="UsFederalCapitalLossCarryforwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pkg_WhitePapersMember" name="WhitePapersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pkg_WriteOffofDeferredFinancingCostsMember" name="WriteOffofDeferredFinancingCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
