Jetflow Hornet Complete Bladder Replacement System Jetflow Manifold adapts any standard water bottles for use in a hydration pack Smartwater, Fiji, Aqufina, Gatorade, Propel, Powerade, Vitamin Water, Sobe, Soda Bottles, Nalgene style and hundreds more can be used Bottles can be re-used and recycled with out the cleaning like with a bladder. Uses any Standard Water Bottle, Hornet Includes Jetflow Piston Tritan 1 Liter Bottle and Cleaning Kit Eliminates fungus growth, funny colors and plastic flavors of a bladder Includes Piston Cleaning Kit and Bottle for Cleaning Hoses