Hydration Bladder Water Reservoir Pack for 2 liter 2L Backpack Bicycling Camping Hiking Convenient and Health Our hydration bladder manufactured of microban anti-bacteria material. Patented Glass AS technology makes it a high smooth interior surface. The smoothness of the liner prevents the germ and the lime from adhension, which promotes health. It's simple to drink, pull the rubber mouth piece out and the water comes right out. Push rubber mouth piece back to close, You don't have to bite anything! Our water bladders passed pneumatic pressure test, 24 hour swing test and 24 hour vibration test. It is completely pressure-tolerant and leak proof for carefree biking, running, hiking and other outdoor adventures! Durable and soft anti-microbial mouthpiece for wholesome and effortless sipping. Easy to bite with 90-degree turn mouthpiece. Easily accessible shutoff valve. Premium quality neoprene tube cover resists temperature changes in hot and cold weathers. THERMAL TAPE at each end prevents insulation from sliding and wearing off. QUICK-RELEASE TUBE can be detached for easy storing. AUTO-SHUTOFF VALVE prevents leaking when tube is detached. Best water reservoir SGS Verification Military Class Quality, 100% odorless, tasteless, FDA Approved, BPA- Free material.