Suitable for outdoor hiking running and cycling sports travel. replacement water backpack 2L BPA-free waterproof water storage bag <p>Food-safe materials: Our water bags are made of high-quality, antibacterial, food-safe materials without BPA. They are odorless, non-toxic, and keep drinks fresh at all times. So you and your children can drink from them with peace of mind.</p> <p>Leak-proof design: The improved soft drinking spout is equipped with an easy-open/close valve to prevent leaks. By biting it, you can easily control the water flow; if you don't bite, no water will flow out. At the same time, we are equipped with a detachable quick-release connector. When you pull out the hose, it closes automatically, keeping the water bag full and preventing water from leaking. This saves water and prevents accidental leaks from your backpack.</p> <p>Durability: The water bag has been air pressure tested and is completely pressure-resistant. The double-sided sealing technology significantly increases its durability. In addition, the design of the water bag reduces liquid flow, which improves the stability of the backpack at high speeds. In addition, the water bag is compatible with most backpacks, so you can buy it with confidence and use it for a long time.</p> <p>Large opening for easy cleaning and filling - Our water bag has one of the largest openings on the market. The large opening makes it easy to pour water. You can also easily reach inside the bag with your hand or a bottle brush, which makes cleaning easier. The 4-inch screw cap is easy to open and close. For cold water, simply add ice from a spoon or the freezer compartment of your refrigerator.</p>