Water Bag Hydration Bladder Water Reservoir Pack for 2.5L Backpack System ,Easy to Clean and Full Water Reservoir, BPA Free Tasteless Water Bag Packs, Most Durable Health for Cycling, Climbing, Hiking Can be put into backpack and backpack"s shoulder strap. Food-grade premium quality anti-bacteria materials. Thick TPU bladder material is pressure-tolerant and wear-proof. Manufactured with leak proof sealing technology. Can be used to store water with -20 to 50 degree Celsius. Compressive resistance to abrasion Tube connected to the bottom of the bladder. 100% Odorless,Taste-free and BPA-free.