Description:Hydration Vest Backpack: This running vest is designed to hold a 1-2L water bladder (not included), allowing for quick hydration during your run. It's for medium to long distance runningMaterial: Running vest is made of polyester, lightweight, and comfortable to wearFeatureErgonomic designed vest bag comes with an adjustable chest strap that guarantees the fit, keeping the pack from bouncing while running. It also features reflective stripes that glow at night ensuring safe running or cycling after darkMultiple Pockets: The backpack has multiple pockets at the front where you can store items like water bottles, keys, mobile phones, and more. The back can accommodate items like a bladderVersatile Use: This water backpack isn't just for running or hiking; it's also suitable for other outdoor activities such as cycling, mountain climbing, and marathonsSpecification:Material: PolyesterSize Chart:38 cmx32 cm/14.96 inchx12.60 inchPackage Includes:1?Hydration VestNote:Please allow slightly errors due to manual measurement and different monitors.