These lightweight packs, made of lightweight 210-denier HT nylon and 420-denier nylon, feature an innovative Windtunnel™ back panel that gulps massive amounts of air to cool your back. Anatomically padded trampoline configuration vents warm air through a chimney and draws cool air from side intakes. Articulated back provides a close, comfortable fit even while twisting, stretching and turning. Articulated hipbelt and shoulder straps are wrapped in Dri-Lex® moisture-wicking fabric and breathable mesh providing a comfortable, secure platform for carrying. Stretch front and side pockets. Removable top pocket converts to lumbar pack. Integrated rain cover. Imported. Dimensions: 27.5"H x 13"W x 11"D. Capacity: 3,051 cu. in. Weight: S/M 3 lbs. 11 oz., M/L 3 lbs. 12 oz. Sizes: S/M, M/L. Color: Graphite Grey/Silver.