<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="../4_X02.xsl"?><ownershipDocument>    <schemaVersion>X0303</schemaVersion>    <documentType>4</documentType>    <periodOfReport>2010-03-05</periodOfReport>    <notSubjectToSection16>0</notSubjectToSection16>    <issuer>        <issuerCik>0001325281</issuerCik>        <issuerName>KAPSTONE PAPER &amp; PACKAGING CORP</issuerName>        <issuerTradingSymbol>KPPC</issuerTradingSymbol>    </issuer>    <reportingOwner>        <reportingOwnerId>            <rptOwnerCik>0001385765</rptOwnerCik>            <rptOwnerName>Keneally Timothy P</rptOwnerName>        </reportingOwnerId>        <reportingOwnerAddress>            <rptOwnerStreet1>ONE NORTHFIELD PLAZA</rptOwnerStreet1>            <rptOwnerStreet2>STE. 480</rptOwnerStreet2>            <rptOwnerCity>NORTHFIELD</rptOwnerCity>            <rptOwnerState>IL</rptOwnerState>            <rptOwnerZipCode>60093</rptOwnerZipCode>            <rptOwnerStateDescription></rptOwnerStateDescription>        </reportingOwnerAddress>        <reportingOwnerRelationship>            <isDirector>0</isDirector>            <isOfficer>1</isOfficer>            <isTenPercentOwner>0</isTenPercentOwner>            <isOther>0</isOther>            <officerTitle>Vice President</officerTitle>        </reportingOwnerRelationship>    </reportingOwner>    <nonDerivativeTable>        <nonDerivativeTransaction>            <securityTitle>                <value>Common</value>            </securityTitle>            <transactionDate>                <value>2010-03-05</value>            </transactionDate>            <transactionCoding>                <transactionFormType>4</transactionFormType>                <transactionCode>S</transactionCode>                <equitySwapInvolved>0</equitySwapInvolved>            </transactionCoding>            <transactionTimeliness>                <value></value>            </transactionTimeliness>            <transactionAmounts>                <transactionShares>                    <value>10000</value>                </transactionShares>                <transactionPricePerShare>                    <value>10.511</value>                    <footnoteId id="F1"/>                </transactionPricePerShare>                <transactionAcquiredDisposedCode>                    <value>D</value>                </transactionAcquiredDisposedCode>            </transactionAmounts>            <postTransactionAmounts>                <sharesOwnedFollowingTransaction>                    <value>38600</value>                </sharesOwnedFollowingTransaction>            </postTransactionAmounts>            <ownershipNature>                <directOrIndirectOwnership>                    <value>D</value>                </directOrIndirectOwnership>            </ownershipNature>        </nonDerivativeTransaction>    </nonDerivativeTable>    <footnotes>        <footnote id="F1">The price is a weighted average price. The reporting person will provide any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within a range.</footnote>    </footnotes>    <ownerSignature>        <signatureName>Timothy P. Keneally by Power of Attorney</signatureName>        <signatureDate>2010-03-05</signatureDate>    </ownerSignature></ownershipDocument>
