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                                                                       Exhibit 5


                                  May 26, 2004


AptarGroup, Inc.
475 West Terra Cotta Avenue, Suite E
Crystal Lake, Illinois 60014


                  Re:      AptarGroup, Inc.
                           Registration on Form S-8

Ladies and Gentlemen:

                  We refer to the Registration Statement on Form S-8 (the
"Registration Statement") being filed by AptarGroup, Inc., a Delaware
corporation (the "Company"), with the Securities and Exchange Commission (the
"Commission") under the Securities Act of 1933, as amended (the "Securities
Act"), relating to the registration of 2,580,000 shares of Common Stock, par
value $.01 per share (the "Shares"), of the Company, together with 2,580,000
Preferred Stock Purchase Rights (the "Rights") associated therewith, to be
issued under the Company's 2004 Stock Awards Plan and 2004 Director Stock Option
Plan (collectively, the "Plans"). The terms of the Rights are set forth in the
Rights Agreement dated as of April 7, 2003 (the "Rights Agreement") between the
Company and National City Bank, as Rights Agent.

                  We are familiar with the Amended and Restated Certificate of
Incorporation of the Company, the Amended and Restated By-laws of the Company
and the resolutions of the Board of Directors of the Company relating to the
Plans and the Registration Statement, the Plans and the Registration Statement.

                  In this connection, we have examined such records, documents
and questions of law, and have satisfied ourselves as to such matters of fact,
as we have considered relevant and necessary as a basis for the opinions set
forth herein. We have assumed the authenticity of all documents submitted to us
as originals, the genuineness of all signatures, the legal capacity of all
natural persons and the conformity with the original documents of any copies
thereof submitted to us for our examination.


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SIDLEY AUSTIN BROWN & WOOD LLP                                           CHICAGO

AptarGroup, Inc.
May 26, 2004
Page 2


                  Based upon the foregoing, we are of the opinion that:

                  1. The Company is duly incorporated and validly existing under
the laws of the State of Delaware.

                  2. The Shares will be legally issued, fully paid and
non-assessable when (i) the Registration Statement, as finally amended, shall
have become effective under the Securities Act; (ii) the Company's Board of
Directors or a duly authorized committee thereof shall have duly adopted final
resolutions authorizing the issuance of the Shares as contemplated by the
Registration Statement and the relevant Plan; and (iii) certificates
representing such Shares shall have been duly executed, countersigned and
registered and duly delivered against receipt by the Company of the
consideration (not less than the par value thereof), if any, provided in the
applicable Plan.

                  3. The Rights associated with the Shares referred to in
paragraph 2 will be legally issued when (i) such Rights have been duly issued in
accordance with the terms of the Rights Agreement; and (ii) certificates
representing such Shares shall have been duly executed, countersigned and
registered and duly delivered against receipt by the Company of the
consideration (not less than the par value thereof), if any, provided in the
applicable Plan.

                  We do not find it necessary for the purposes of this opinion
letter to cover, and accordingly we express no opinion as to, the application of
the securities or blue sky laws of the various states or the District of
Columbia to the issuance and sale of the Shares or the associated Rights.

                  This opinion letter is limited to the General Corporation Law
of the State of Delaware.

                  We hereby consent to the filing of this opinion letter as an
exhibit to the Registration Statement and to all references to our firm included
in or made a part of the Registration Statement. In giving such consent, we do
not thereby admit that we are within the category of persons from whom consent
is required by Section 7 of the Act or the related rules promulgated by the
Commission.



                                Very truly yours,



                                /s/ Sidley Austin Brown & Wood LLP