The Jetflow hydration system replaces a soft side bladder with a water bottle or bottled beverage of your choice. The bottle rests upside down (held into place in a Jetflow pack) attached to the manifold. Two hoses connect to the manifold. One delivers liquid to the Bite value and the other releases vacuum pressure through the Jet Valve. Advantages over a bladder include no plastic taste and easier maintenance by recycling bottles or washing a bottle instead of a moldy bladder!