Made Of 420D Nylon Ripstop And Mesh. Adjustable Shoulder Straps. Adjustable Waist And Sternum Straps For Extra Stability. Front Zippered Pocket. Inside Zippered Pocket. Back Zippered Pocket Holds Refillable Reservoir. Reservoir Features Wide Mouth Opening And Flow Tube With Drinking Valve. 1 Liter. Spot Clean/Air Dry.