420D POLYESTER OXFORD PU 2X Comfortable multi-sport pack organizes gear, offers hands-free hydration with included 2-liter reservoir; great for lightweight hiking, biking, and more Four zippered pockets organize supplies with dividers and straps to hold gear in place; stretch elastic side panels expand for additional cargo Articulated shoulder straps with adjustable sternum strap; webbed waist belt for added comfort and security Deluxe padded back with Airway cooling system to wick away sweat; reflective safety piping for added safety