PREMIUM QUALITY: The water bladder is made of high-quality PE + EVA, which is environmentally friendly and can be easily recycled. The hydration bladder is odorless, BPA FREE. The water reservoir bladder passed pressure test, it is completely pressure-tolerant.Compatible with most hydration backpacks LEAKPROOF: The top opening and bottom connection are leak proof. The wide-mouth opening with sliding lock closure enhances leakproof function, and makes it easy to replenish water, clean and dry EASY TO DRINK: You won't be slowed down with our soft bite-valve. Simply bite the mouthpiece to suck the water. Pull to drink and push back to lock. It also has a dustproof cover to keep it clean. It conveniently quick and easy to have a drink in marathon running, hiking, camping, biking, cycling, climbing, backpacking and all outdoor sports REMAIN PEFECTLY HYDRATED: The water bladder can withstand temperatures from -20 to 55 degrees Celsius. The tube can resist temperature changes in hot and cold weather. The hydration bladder is compatible with most hydration packs. And the tube provides a wholesome flow, easy to drink, keeping you hydrated PORABLE: The perfect size water bladder is compatible with most running backpack. This is a must-have for most cycling, walking or hiking, running enthusiasts. The great backpack reservoir replacement kid & youth & adult