CamelBak has done it again, maximum features with minimal weight. Air Support Back Panel with Body Mapping Technology will help you keep cool. Your water bottle is centered in the middle of the belt for easy access with either arm. Need a new water bottle? We've got you: Podium Dirt Series 21 oz Water Bottle is included. Reflective features help you be seen on and off the trail. Minimalism to the max! | CamelBak Podium Flow 4 Hydration Belt