2L Water Tank, Folding Water Bottle, Outdoor Water Bag, Portable Water Bag, Water Bag Odorless and High-quality Material, Safer: The outdoor replacement hydration backpack is made of high-quality antibacterial material. Food-grade TPU material and TPU tube make the hydration backpack safer. Odorless, non-toxic, BPA-free and FDA-approved. The water tank has been tested for air pressure and is completely pressure-resistant. Double-sided sealing technology for more durability. Large Capacity 2 Liter Water Bag: The 2-liter water bag is designed to fit most backpack sizes. You can use it in outdoor activities: hiking, running, cycling, skiing, riding, camping, cycling, mountaineering, etc. It is a must-have item for sports enthusiasts and an ideal gift. Large opening for easy filling and drinking of water. The 2-liter water bag has a large opening for easy filling of water. This 2-liter water bag can withstand temperatures from -20 to 50C. To get cold water, just add ice cubes directly with a spoon or the ice maker of the refrigerator. The TPU tube is flexible and more resistant to bending, making it easier to adjust when drinking. Waterproof & Ergonomic - The military-grade hydrator rim is equipped with military-grade waterproof threads to ensure that the 2-liter water tank is pressure-resistant and waterproof. The bite valve has an on/off switch. Simply bite the mouthpiece to drink water. The dust cover protects the mouthpiece from dust. Simply pull the valve up to drink and push it down to close.