1L/2L/2.5L/3L hydration bladder with largest opening, which helps you easily to fill the water and ice cubes into your bladder bag, and easy to clean Our water bladder perfect for camping, hiking, biking, running, cycling, climbing, backpacking, hunting & skiing, any other outdoor sports you like When you fill this bottle with water, put it in your bag, don't worry about leaking water and wet something else in your bag. Reliable leak proof water reservoir pouch, roll-top seal, large opening. Our hydration bladder has one of large opening, and the big opening makes for easy pouring of water. For cold water, simply add ice cubes directly from a scoop or refrigerator ice dispenser. The smooth inner of water reservoir promotes health and is easy to clean. PEVA materia,100% free of BPA and other harmful leaching chemicals,Recommended Water temperature -20℃ to 50℃/