Meets military 24-hour standards for resistance to chemical agents. Easily slips into most CamelBak® hydration carriers. When used with Military Protective Masks, you and your water supply will never be exposed to these conditions. Slips into the back pocket of the ThermoBak™ 3 liter, allowing immediate access to either it or your standard reservoir. Made with the highest grade of proprietary butyl polymer; Attaches directly to standard protective mask fittings - fits M17, M70, M40, MCU2P, and C4 masks. Integrates with any 70 or 100 oz. reservoir pocket. Secure screw cap closure. Capacity: 70 oz. Dimensions: 17 x 6 x 1" Volume (Including water): 126 cubic inches.