Midweight Hydration Pack great for short or extended day trips. Comes with 2 Liter Cyclone® bladder. Expandable quick stash mesh pocket. Deluxe padded back with AirWay cooling system allows air to travel to hard to reach places. Two external zippered pockets. Bungee compression system. Articulated shoulder straps. Elastic adjustable sternum straps for added comfort and flexibility. Abundant reflective safety tape. CD and MP3 pouches with headphone port. Capacity: 760 cubic inches. Dimensions: 8.5 in H x 8 in W x 4 in D.Weight: 1lb. 7oz. Gray.