600 denier polyester material.Top quality craftsmanship, heavy duty construction. Heavy duty anodized aluminum frame. 3 large vented outside pockets. Extra wide heavy padded kidney pad and strap. Heavy padded shoulder straps. Waterproof lining. Accessory flaps. A favorite of military personnel, campers, bicyclist, hikers, fisherman, outdoors men, and much much more. GI Government Issued style. Olive Drab - large GI type ALICE pack w/frame, 22" x 20" x 19." Dimensions: 22" x 20" x 19" (inches).