The ACT Zero series was built with lighter, faster trips and thru-hikers in mind! These packs allow the experienced backpacker or mountaineer to carry necessities without added back weight. . . . . . . Aircontact back system. . Vari Quick System for easy adjustment to any back length. . X-Frame construction. . Valuables pocket. . Wet pocket. . SOS label. . Lightweight. . Adjustable lid. . Side pocket. . Padded hip belt. . Sternum strap. . Hydration System 3.0 L compatible. . Weight: 3 lb. 6 oz.. . Volume: 3050 + 920 cu in. (50 + 15 L). . Dimensions: 30 x 12 x 9.4 in.. .