Description: Running Vest Hydration Pack: This running vest is designed to hold a 1L 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.Adjustable Fit & Features: The lightweight hydration vest has adjustable straps to fit your size perfectly. It also features reflective prints that glow at night ensuring safe running or cycling after dark.Storage Space: The running vest offers enough pockets to store your essentials like mobile phone, keys, water bottles, hydration flasks, bladders, etc., during outdoor activities.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. Specification: Material: Polyester, Size Chart: Length: 40cm/15.75inchBust: 88cm-108cm/34.65inch-42.52inch Package Includes: 1Hydration Vest Note: Please allow slightly errors 1-2cm differences due to manual measurement.