Running Vest for Women Men, Adjustable Chest Straps Running Hydration Vest Backpack with 500ml Soft Flask, Lightweight Breathable Reflective Running Vest for Trail HikingLightweightThe IX INOXTO sports backpack only weighs 200 grams, and there are pockets on the left and right shoulder straps for storing 500ML TPU bottles. There is a zipper pocket under the right pocket, which can store your mobile phone and items, so you can listen to music and exercise at the same time! BreathableThe 5L hydration vest adjusts to your back while gently protecting your muscles. The backpack's back and shoulder straps feature