POWER OF ATTORNEY
  KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of Tony J. Steenkolk, David Rouse and Kent A. Pflederer, signing
singly, the undersigned's true and lawful attorney-in-fact to: (i) execute for
and on behalf of the undersigned, in the undersigned s capacity as an executive
officer or director of Packaging Corporation of America, a Delaware corporation
(the "Company"), statements of beneficial ownership on Forms 3, 4 and 5 under
Section 16(a) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act") and the rules thereunder; (ii) do and perform any and all acts for and on
behalf of the undersigned which may be necessary or desirable to complete and
execute any such Form 3, 4 and 5 and timely file such form with the United
States Securities and Exchange Commission and any stock exchange or similar
authority; and (iii) take any other action of any type whatsoever in connection
with the foregoing which, in the opinion of such attorney-in-fact, may be of
benefit to, in the best interest of, or legally required by, the undersigned, it
being understood that the documents executed by such attorney-in-fact on behalf
of the undersigned pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as such attorney-in-fact may approve in
such attorney-in-fact's discretion.
  The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of this power of
attorney and the rights and powers herein granted.  The undersigned acknowledges
that the foregoing attorneys-in-fact, in serving in such capacity at the request
of the undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Exchange Act.
  This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.  This Power of Attorney revokes all prior powers of
attorney delivered by the undersigned relating to the subject matter hereof.
  IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 22nd day of December 2021.

/s/ Darla Olivier