The CamelBak UnBottle adds hours of hydration to any pack. The versatile reservoir with external fill, insulated reservoir sleeve, attachment points, carry handle/hanger loop, and zippered tube access is a uniquely designed water pack ideal for outdoor activities. Designed to hold 100 oz. of water, the Antidote Reservoir features Quick Link System, 1/4 turn - easy open/close cap, lightweight fill port, dryer arms, center baffling and low-profile design, patented Big Bite valve, HydroGuard technology, PureFlow tube, and easy-to-clean wide-mouth opening. Constructed with 600-denier polyester. Weighs 5.3 oz. 18" x 8-1/2" x 4".