PREMIUM MATERIAL - All parts of hydration bladder made of premium material, which is no plastic taste and safe for drinking. With dust proof cover design, absolutely keep it clean. Just feel free to drink it. MILITARY LEAKPROOF - With upgrade 90 degree rotatable soft mouthpiece allows for easy drinking. Shut On or Off valve helps to adjust water flow. Bite can control water flow conveniently and effectively. Even not bite, water don't leak out. With detachable quick release tube, auto shut off while the tube is removed, the 2L bladder still stay filled without leak. Passed pneumatic pressure test, 24 hour swing test and 24 hour vibration test. It is completely pressure-tolerant and leak proof. EASY and QUICK TO DRINK - With high flow bite-valve, you won't be slowed down while hiking. Just bite the mouthpiece to suck water. Pull to drink and push back to lock. Allows you to shut off flow when not using and easily pull with your teeth to restart flow. 13.8' x 6.8' perfect size is compatible with most hydration packs. A must have for most cycling, walking, or hiking running enthusiasts. STRONG DURABILITY - Water bladder withstand temperatures from -20 to 50 degrees celsius, and resists temperature changes in hot and cold weathers. The tube (0.4' diameter, 36' long) provides a wholesome flow for easy drinking, and keeping you hydrated while hiking, running, biking, or cycling. LARGE OPEN FOR EASY FILLING and CLEANING - The 2L hydration bladder opening design is so large that you can fill or refill water easily even you are not taking it out of hydration backpack. Also can put some big ice cubes into water bladder to keep water cool. Large opening help you reach every corner inside, and give your water reservoir bladder throughly cleaning.