FUNCTIONAL – The Vapor Krar is 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 – Hourglass bladder design for no bounce 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 IDEAL - Perfect for Runners looking for an apparel like fit. This vest is a second skin with no bounce and room to carry your gear, nutrition, or additional water. Storage Capacity: 732 cu in/12 Liters; Weight with Bladder: 14 oz/392 g Nathan Men’s Hydration Pack Running Vest VaporKrar 2.0 12L Capacity with 1.6 L Water Bladder Hydration Backpack Running Marathon Hiking Outdoors Cycling and More - BX5F87QVX