Constructed of 600 denier polyester. 3 liter hydration system. MOLLE compatible to accommodate additional MOLLE pouches and accessories. Neoprene covered plastic hose with soft belt valve. Bite valve with on/off switch. Backpack straps with quick release buckles. Back flap. Front, screw cap. Top carry handle & front carry handle. This handsfree hydration system is great for outdoor activities, including running, jogging, hiking, bicycling, rock climbing and much more. Quench your thirst with this handsfree tactical hydration backpack. Coyote Tan back strap hydration system.