PREMIUM QUALITY: Unigear water bladder is made of high quality TPU flexible food grade material. Non-BPA. Your taste odorless hydration bladder has passed a bearing pressure test to ensure it is leak proof and ready use LOW-PROFILE DESIGN: Unigear water bladder for hiking backpack offers unparalleled stability which reduces liquid movement for increased pack stability at high speed LARGE OPENING FOR EASY CLEANING: Inner surfaces easily accessible for easy cleaning and drying. For cold water, ADDING ICE CUBES directly from a scoop or refrigerator ice dispenser SOFT MOUTHPIECE: Durable and soft mouthpiece for wholesome and effortless sipping. Easily accessible shut off valve 4 MODEL OPTIONS: We have 4 different models (1.5L, 2L, 2.5L, 5L) for you to choose. Different sets just to meet your different needs.You can also confirm whether to purchase a cleaning kit based on your needs Unigear Hydration Water Bladder Reservoir, the perfect solution for all your outdoor activities. Made from high-quality TPU flexible food grade material, this hydration bladder is Non-BPA and odorless. It has passed a bearing pressure test to ensure it is leak proof and ready to use.