100%polyester Imported LIGHTWEIGHT — The hydration backpack is only 0.73lb/333.5g. Made of waterproof and anti-scratch oxford fabric. Durable and portable water backpack. Enough to get you through a day of hiking, cycling, running or biking CONTAIN WATER BLADDER — Zavothy hydration pack backpack with 2L water reservoir. The bladder is BPA-free and anti-leak guaranteed. Stay hydrated in any time without taking an extra water bottle. Convenient and frees up your hands LESS PRESSURE TO BACK AND SHOULDER — The backside of the hydration backpack is designed with breathable Y shape soft air mesh. Combining with length-adjustable shoulder gird. Minimize pressure, less tiredness, comfier MULTI-FUNCTIONAL — The mountain bike backpack can easily store a bike helmet.Practical for daily running exercise, biking, or short-distance hiking ZAVOTHY assures you that our high-quality hydration backpack will exceed your expectations! We are committed to providing you with a superior product. However, if you find yourself less than fully satisfied with your purchase, we encourage you to reach out to us. Our team is here to address any concerns and ensure your happiness
