The Jetflow Hydration System replaces your old hydration bladder (reservoir) with simple and inexpensive options. The manifold is intended to be used with a standard water bottle thread common to Smartwater, Aquafina, Fiji, Pepsi, and Coke style bottles. Generally bottles over .5 liter in volume. The system also includes a 63 mm adapter that will accept Nalgene, Camelback, Lifeline, and a lot of common hard side bottles used in outdoor recreation. Enjoy a lifetime warranty on all parts except the bite valve.