Made of heavy weight 600 denier polyester. Contains a 3 liter bladder. MOLLE compatible to accommodate additional MOLLE pouches and accessories. Neoprene covered plastic hose with bite valve. Bite valve with on/off switch. Quick release shoulder straps. Sternum strap. Top carry handle. Zipper closure bladder compartment. Front zipper closure storage compartment. 2 d-rings at bottom. Loop for name tape, branch tape or other patch attachments. 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 pack. Black rapid trek hydration pack.