【PREMIUM QUALITY】 TPU or PEVA . It won’t leave a bad taste in your drink. This water reservoir can withstand temperatures from -20 to 50 degrees Celsius. 【LEAKPROOF, QUICK RELEASE TUBE】The hydration bladder tube is easy to connect and disconnect with one hand. The shutoff valve will automatically close and won’t leak without connecting tube. Without the tube connected you can easily and quickly refill the hydration bladder, no worry about it leaking all over the place. 【EASY FILLING AND CLEANING】Our hydration bladder opening mouth is large enough so you can fill/refill water very easily even without taking it out of hydration backpack. You can also put some ice cubes into water hydration bladder to keep water cool. The big opening allows you reach every corner inside and give your water reservoir bladder thoroughly cleaning. So you can always maintain your drinking water bladder at high hygiene. 【HIGHER CAPACITY】 This water bladder bag offer 3 different Sizes for you 1.5 hydration bladder, 2 hydration bladder and 3 hydration bladder. It meet your defferent needs for outdoor, enough for a day drinking of hiking, cycling, climbing, running or biking. the hose length is 105cm, long enough to drink it straight from the backpack. 【EASY TO CARRY】 Lightweight water bladder is portable enough to bring.It can be put compactly in your hydration vest pack.