1994 World Cup
Upper Deck / Minute Maid
In 2003 one set of 25 cards were foil stamped with the Project Backpack logo and offered for sale to collectors. Each card comes with it's own Certificate of Authenticity. It's been a long time since I've seen any of these cards offered for sale, though other cards, mainly baseball crads, do appear from time to time. The full checklist can be found here - Upper Deck - 1994 World Cup - Minute Maid.