Description: 【Hydration Vest Backpack】: This running vest is designed to hold a 2L water bladder at the back (not included), allowing for quick hydration during your run. It's for medium to long distance running. 【Material and Package】: Running vest is made of polyester, lightweight, , and comfortable to wear. Package Includes 1 running hydration vest, equipped with 2x 500ml TPU soft water bottles. 【Comfortable Wear】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. New and old soft water bags are shipped randomly Specification: Material: Polyester Water Bottle Capacity: 500ml Size Chart:Length: 44cm/17.32inch, Chest: 78.5cm/30.91inch, Suitable for Chest: 78cm-86cm/30.71inch-33.86inch; Package Includes: 1 Hydration Vest 2 Water Bottles Note: Please allow slightly errors due to manual measurement and different monitors.