FUNCTIONAL – Vapor Howe equipped with a 1.6 L bladder - quick release valve system, Water-resistant pill pocket, and Two easy-access front bottle pockets (bottles not included) DESIGN - Lightweight and comfortable – no bounce, breathable materials, and form fitting – equipped with Soft-touch, no chafe elastic perimeter binding. Storage Capacity: 732 cu in/12 Liters; Weight with Bladder: 14 oz/392 g FIT - Vest fit is snug and overall sizing tends to run slightly on the smaller side, so it is recommended that anyone on the higher end of a given size may want to size up! UNIQUE FEATURES – 360 degree Reflective hits for runs in dusk/dawn, Internal compression system tightens the load against your back for stability and Zippered water-resistant chest pocket for smartphones IDEAL - Perfect for Marathons, Trail Running, Hiking, Cycling, Climbing, Outdoor enthusiasts, and Hydration-on-the-go! Nathan Women’s Hydration Pack Running Vest VaporHowe 2.0-12L Capacity with 1.6 L Water Bladder Hydration Backpack Running Marathon Hiking Outdoors Cycling and More - BCJOISR2C