Milspec G.I. Type Large Alice Pack features 3 large vented outside pockets, padded kidney pad, and shoulder straps, waterproof lining, and accessory loops. ALICE stands for All-Purpose Lightweight Individual Carrying Equipment system and was adopted by the United States Army in the 1960s to help soldiers carry large heavy packs. Measuring 22" x 20" x 19", the Large Alice Pack comes with a Heavy Duty Aluminum Frame.