Features Professional military Bladder Bag, Eco-friendly TPU material,100% odorless, tasteless, BPA- Free material FDA APPROVED: Food-grade premium quality anti-bacteria materials. Thick TPU bladder material is pressure-tolerant and wear-proof 3.54 inch openings. Large opening for easy cleaning and easily adding water and ice Strong elasticity, not damaged, When filled with water, can withstand squeezing. Can withstand the water temperature range: -20 to 50 degree Celsius Durable and soft anti-microbial mouthpiece for wholesome and effortless sipping Specifications Color: Army Green Capacity: 2 Liter Size: 180mm*370mm 2.5 Liter Size: 185mm*450mm 3 Liter Size: 190*500mm PVC Suction pipe: Length 1 meter; Mouth diameter: 100mm Notes: Adding water between -20 to 50, no soda, wine or milk. Hydration Bladder cannot hold juice,milk,soft drink,liquor, etc. Please soak the bladder for one hour in the warm salt water about 30-40 degree Celsius and then clean it before using.(The salt concentration should be controlled at about 7%.) Clean with a mild detergent and rinse the reservoir thoroughly. Make sure it is completely dry, inside and outside before storing. Package 1 x Hydration System Water Bag