When your training runs take you up mountains, through valleys, and across ridges, you'll need the Ultimate Direction Ultra 4. 0 Hydration Vest to keep you going mile after mile. With pockets for two water bottles, snacks, and a light rain jacket, the Ultra 4. 0 carries everything you need without adding needless weight or bulk to your running kit. Fit is everything when you're running long distances, so Ultimate Direction gave the vest its Comfort Cinch system, which consists of two bungee-like straps along the back, that allows the fit to be quickly tailored to match your torso with a quick pull of the toggles.