BLACKHAWK! 3 Padded shoulder straps with D-rings for equipment attachment Detachable, elasticized sternum strap with silent Release buckle Compartments are closed by YKK zipper and sliders with silent pulls Optional hydrastorm hydration System Made of 1000 denier nytaneon Nylon Mid-sized, frameless backpack Detachable sternum strap and padded, removable waist belt for extreme versatility Constructed of heavy-duty 1000 denier nylon Compatible with BLACKHAWK! Hydration System 2000 cu. in. / 37 L