Exhibit 99.1 CERTIFICATION To my knowledge, this Report on Form 10-Q for the quarter ended June 30, 2002, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in this Report fairly presents, in all material respects, the financial condition and results of operations of Checkpoint Systems, Inc. By: /s/ George Off ------------------------------------- Name: George Off Title: Interim Chief Executive Officer By: /s/ W. Craig Burns ------------------------------------- Name: W. Craig Burns Title: Executive Vice President, Chief Financial Officer and Treasurer Date: August 14, 2002