Product description Size: The backpack is 29cm long and 41cm high Water bag: 351*175mm Color: gray, black gray, gray red Material: Nylon Package content: 1pcs outdoor sports backpack 1pcs outdoor sports water bag 1.COMFORT FOR YOU: Ergonomic design, adjustable belt and chest strap for women and men, children. The chest straps make sure they don't jump when you move. Perfect for hiking, running, marathons, cycling, traveling, etc . Bicycle drinking backpack with a drinking bladder is also a great bike partner! 2. [High Quality Material]: Lightweight and waterproof high density nylon, rope construction, high quality buckle, comfortable fit, it will definitely not burden you while doing sports. EVA foam padded back and shoulder straps with ventilation channel, quick-drying materials , for maximum breathability and comfort. 3.Running backpack with hydration system: bladder compartment with hanging system, compatible with 2L hydration bladder, FDA-compliant. Thanks to the extra large screw cap, the hydration bladder can be filled with water with ease. The removable hose makes cleaning easy and uncomplicated-just rinse, empty and turn over. 4.Perfect outdoor equipment: lightweight jogging backpack, unique design for optimal comfort and freedom of movement. Thanks to reflective elements, you can also be seen in dark surroundings. The running backpack women has a heat-insulated bag that keeps your drink warm or cold for hours. 5. [Lightweight, splash resistance and durable]: Perfect outdoor sports gear, made of lightweight and water-resistant nylon material, padded shoulder straps, comfortable for long-distance running, hiking, cycling