FOOD GRADE QUALITY: The hydration bladder is made of food-grade material TPU, pressure-tolerant and wear-proof. The hydration bladder is BPA free, odorless, safe for drinking LARGE OPENING & EASY CLEANING: Our hydration bladder has a large top opening for easy to fill the water, and easy to clean. The inner wall provides a healthy and fresh drinking experience EASY DRINK: Simply bite the mouthpiece to drink. The soft mouthpiece with an easy accessible ON/OFF valve prevents leakage. The water flow is conveniently controlled by biting, and the water does not leak out when not biting MAINTAIN PEFECTLY HYDRATED: This hydration pack bladder can withstand temperatures from 0 to 40 degrees Celsius. The tube is resistant to temperature changes in hot and cold weather. The water bladder is compatible with most hydration packs. And the tube provides wholesome flow, easy to drink, keeps your hydrated EXTENSIVE APPLICATIONS: The convenient hydration reservoir is perfect for your outdoor marathon, running, hiking, biking, camping, cycling, backpacking and skiing, any other outdoor sport you like.