High Sierra Longshot 70 Hydration Pack mesh Large multi compartment design. Slide-access hydration compartment with shoulder strap hose jacket, holds a 2-liter reservoir. SLIDELOCK reservoir has a wide opening to make it easier to fill, add ice and clean. Insulated water tube cover prevents water from freezing in the tube. Hinged front pocket holds a helmet. Front zippered pocket holds bicycle tools, accessories or media player Vapel mesh Airflow padded back wicks moisture. Vapel mesh adjustable backpack straps. Tuck away, adjustable waist best secures the pack. Adjustable sternum strap helps stabilize the pack. Reflective loop holds bike LED blinker.\\ Size: 18.0" x 11.0" x 6.75" Capacity: 1098.0 cubic-Inch Weight: 1.62 lbs. Materials: Grid-Weave Duralite, Shiny Mini-Waffle Weave