Description: Hydration Vest BackapackRunning vest fit for 2L water bag (not included,) for quick hydration during running, suitable for medium and long distance sports.Material and DesignRunning vest is made of polyester, lightweight, sturdy, and comfortable to wear.Multiple Storage CompartmentDesigned with 10 front pack pockets, you can store items such as water cup, key, phone, , etc., and bladder or other items can be held in the back.FeatureErgonomic designed vest bag comes with an adjustable chest strap that guarantees the great fit, keeping the pack from bouncing while running. ApplicationsThis backpack is not just for running and hiking. but also suitable for outdoor activities, such as cycling, mountaineering, climbing, marathons, etc. Specification: Material: Polyester Size Chart: Length 44cm/17.32inch, Bust 78.5cm/30.91inch (chest circumference 78cm-86cm/30.71inch-33.86inch) Package Includes: 1?Hydration Vest Note: Please allow slightly errors due to manual measurement and different monitors.