hydration device is made of pure, simple and durable polyurethane, not plastic . Squeeze it, freeze it, fill it until the sides start to bend. This strong bladder can withstand temperatures from -20 to 50 degrees Celsius and shrug off up to 110 pounds of water pressure, so it will then withstand a variety of situations. The 108cm long and detachable hose, shut-off valve and soft mouthpiece ensure easy and comfortable use. Soft mouthpiece with easy access on/off valve prevents leakage. In addition to the large opening, the detachable hose also allows for easy and uncomplicated cleaning - simply rinse, empty and turn inside out. This hydration bladder is 2 liters. For carefree hiking, running, biking, camping or other outdoor adventures.