Replacement Reservoir and Drink Tube Assembly for 120 oz Alpha and Mustang hydration systems. Our extremely durable 120 oz. collapsible bladder is a one-piece, flexible blow molded bottle with an integral threaded neck that can fit a standard M-1 military canteen cap. The drink tube is attached to a hyperflow bite valve that delivers a high flow rate when drinking, but drip free when not in use. Capable of withstanding freezing temperatures. Sanitation is a breeze with our bottle designed bladder, just rinse and air dry.