Information Vbiger Hydration Backpack with 2L Water Bladder will be an indispensable companion for various outdoor activities. Comfortable Wearing: The soft and lightweight mesh of the Hydration Backpack ensures smooth airflow, maximizing breathability. Besides, the shoulder straps, chest straps, and waist straps are adjustable to offer a snug fit for different body sizes, avoiding the bounce during running. Multi-functional Pockets: You can take everything you need for exercise with our hydration pack, thus freeing your hands. The front compartment can easily accommodate your water bottle, cellphone, keys, food, etc. Meanwhile, the water bladder and another item can fit in the back compartment. Light Weight & Safety Design: The Hydration Pack weighs 8.1oz/230g and the Water Bladder weighs 7.4oz/210g so that you won't feel a heavy load on your back. Also, it is easy to fold and store. The reflective webbing on the front and back increases security, and a lifesaving whistle is included for an emergency, making your outdoor activity safer. 2L Water Bladder: The Water Bladder is made of safe food-grade PEVA, featuring BPA-free, durable, leakproof performances. As the water bladder is 50℃ heat resistant and -20℃ cold-resistant and comes with a big opening, you can easily clean it and add ice cubes. You can drink water directly with the insulated tube, no need to take off the backpack. Nice equipment for cross-country running. Perfect for Various Outdoor Activities: Our high-quality Hydration Backpack with 2L Water Bladder is specially designed to provide enough water supplement during various outdoor adventures, such as marathon, jogging, hiking, mountaineering, biking, backpacking, etc. Features Material: nylon Chest circumference: 35.5-45.27inch Recommended phone size: 5.5inch Size (about): width 16.9''/43cm; height 8.7''/22cm Weight (about): hydration backpack + water bladder 15.5oz/440g; hydration backpack 8.1oz/230g Color: black What you get 1* hydration backpack; 1* water bladder Notice * The actual color may vary slightly from the online image due to monitor color settings. * Please allow slight measurement deviation for the data. * If you want to know more details or have any questions, please look through the detailed page or contact the customer service.