Lightweight and Portable: This 8L capacity hydration backpack weighs only 240g. The back strap and shoulder strap are designed with a sponge ventilation system that generates air circulation when worn. Breathable and durable, suitable for outdoor sports, such as climbing, cycling, skateboarding, running and fitness. Comfortable Fabric: The hydration backpack adopts waterproof fabric, which can better protect the contents of the bag from getting wet in the rain, and the scratch-resistant and wear-resistant nylon fabric is used to better deal with outdoor environments and prolong its service life. Safety design : The hydration backpack adopts night reflective strip, specially designed for night sports. The chest strap is designed to be better fixed during your use, which makes your exercise safer. Leak-proof pocket: The 2L pocket is made of high quality EVA material, it is BPA free and approved by the FDA. 6" water inlet for easy watering, icing and cleaning. Detachable PE water pipe, designed with drinking water switch, convenient for drinking, to prevent leakage. Humanized design: The water backpack adopts shoulder storage bag, side pocket made of netting, a strap on the top, reasonable storage space, convenient for item classification and placement, chest strap design, better fixation during your use, make your exercise more secure.