Hydration pack for when safety and visibility are your top priorities. The Hi Viz™ is used around the globe from Australia to the Panama Canal, whenever visibility is imperative. 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 changing missions or combat environments. Includes our Quick Link™ Exit Port and QL HydroLock™ Bite Valve Adapter: tube clicks off for faster refilling with auto shut-off; new fillport: industry's largest opening with air-light 1/4 turn open/close for quick, secure seal that can't be over-tightened; lighter-weight, lower-profile design.