Go minimal! Our lightest most minimal hydration belt, the CamelBak Ultra Belt stores a 17-oz Quick Stow flask that molds to the shape of your body. The 3D mesh material stays light and breathable on even the hottest runs, and the extra stretch pocket keeps gels, keys and cards safely tucked away. Plus, you won’t be stuck carrying a big empty bottle at the end of your run—once the flask is empty, just fold it up and tuck it away. It even includes an integrated trekking pole carry for the more technical runs.