High Sierra Soaker 70 Hydration Pack Large main compartment holds a 2-liter water reservoir. Easy-access reservoir opening is easy to fill and accepts most brands of water filters. Hands-free reservoir pressure valve. Insulated water tube cover prevents water from freezing in the tube. Tuck-away mesh sport flap is hidden in a zippered pocket and holds a helmet. Zippered front accessory pocket holds bicycle tools, accessories, or CD/MP3 player. Mesh front pocket and monster hook Vapel mesh Airflow padded back wicks moisture. Vapel mesh Airflow adjustable shoulder straps. Adjustable waist belt secures the pack. Adjustable waist belt secures the pack. Reflective loop holds a bike LED blinker Size: 17.25" x 9.0" x 2.0" Capacity: 138.0 cubic-Inch Weight: 2.17 lbs. Materials: Waffle Weave