"Large Opening For Ease Cleaning & Filling Our hydration bladder has one of the largest opening on the market. The big opening makes for easy pouring of water. It is also fairly wide for a hand or bottle brush easily access to the interior hydration bladder. The 4screw on cap goes on and off easily. For cold water, simply add ice cubes directly from a scoop or refrigerator ice dispenser.100% Leakproof--Upgraded soft mouthpiece with easily accessible ON/OFF valve prevents leakage. Conveniently control the water flow by biting, when not bite, the water will not leak out. Quick-release tube is detachable. Auto shut off while the tube is removed, the 2 liter water reservoir will stay filled non-leakingNo ""Plastic"" Smell or Taste:--Hydration bladder is made of premium anti-bacteria material. Taste free, non-toxic, BPA free.It won t leave a bad taste in your drink. The water reservoir bladder passed pneumatic pressure test, it is completely pressure-tolerant. Double sealing side technique has greatly improved durabilityRemain Pefectly Hydrated This 2L water reservoir can withstand temperatures from -20 to 50 degrees celsius. INSULATED TUBE resists temperature changes in hot and cold weathers. L 13.8'' x W 6.7'' Hydration bladder is compatible with most hydration packs. The tube (0.4 diameter, 40 long) provides a wholesome flow for easy drinking, keeping you hydrated when biking, cycling, hiking, or running!Occasions: Our water bladder perfect for camping, hiking, biking, running, cycling, climbing, backpacking, hunting & skiing, any other outdoor sports you like."