Key features of the lightweight 100-oz. CamelBak ThermoBak Hydration Pack are its D-ring attachment points, quick-release shoulder straps, integrated Velcro strips for name tags, tough, abrasion-resistant 1000-denier Cordura fabric exterior, and easy-access external fill with front zippers. More than just a reservoir, the Mil Spec Antidote Reservoir redefines the ultimate delivery system for an operator's water supply and provides maximum adaptability for environments. Features Quick Link Exit Port and QL HydroLock Bite valve adapter, fill port, and the industry's largest opening with airtight 1/4-turn open/close for quick, secure seal that can't be over-tightened. Weighs .9 lbs.