Description: 【Hydration Vest Backpack】: This running vest is designed to hold a 2L water bladder (not included), allowing for quick hydration during your run. It's for medium to long distance running. 【Material】: Running vest is made of polyester, lightweight, , and comfortable to wear. 【Feature】Ergonomic designed vest bag comes with an adjustable chest strap that guarantees the fit, keeping the pack from bouncing while running. 【Multiple Pockets】: The backpack has 10 pockets at the front where you can store items like water bottles, keys, mobile phones, , and more. The back can accommodate items like a bladder. 【Versatile Use】: This backpack isn't just for running or hiking; it's also suitable for other outdoor activities such as cycling, mountain climbing, and marathons. The color of water bags are shipped randomly. 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 2 Water Bag(500ml each) Note: Please allow slightly errors 1-2cm differences due to manual measurement.