USWE's Hydration System is developed for the athlete who demands high performance and pure hydration. The system is compatible with USWE's No Funky Stuff disposable refills, and fits perfectly into almost any pack. Toss the bladder in the recycling bin before it gets funky and grab a fresh refill. The bladders are durable, inexpensive and BPA-free. Key Features: 1 Disposable hydration bladder, Easy open/close adaptor cap, Inner straw, Silicone drink tube, 90 degree bite valve, Handling. Bladders filled with water only can be reused a number of times, just clean with fresh water between uses. Bladders filled with liquids other than water should be replaced to prevent bacterial growth. Get fresh bladders and clean hydration for a very reasonable price. Both drink tube, bite valve and adaptor cap should be cleaned regularly for best possible hygiene. Just detach the bite valve and adaptor cap from the drink tube and drop it in a jar filled with warm water and a teaspoon of soap. Shake the jar for 30 seconds and let it soak for 20 minutes. Then rinse and shake dry. Related products: 5-pack 2.5 liter disposable refills; Quick Seal Coupling set; H2 NDM; H3 NDM; CR2 in-car hydration.