The CamelBak Arc 4 belt system is built around the new run-specific Podium Arc bottle. The Podium Arc bottle utilizes all of the same cap features of the proven Podium bottle collection, with a smaller, more compact bottle that is shaped to fit your grip and slides easily into the belt bottle cages so you can hydrate on the move. The Jet Valve is self-sealing so athletes can grab, drink from and stash the bottle without worrying about opening and closing the valve for every sip. An additional lockout toggle prevents leaks while transporting the bottle. Integrated cages on each bottle allow for stable and secure carrying while on the belts with an easy, positive in-and-out lock that makes access to hydration effortless. The unique shape of Podium Arc fits comfortably in the palm. The Arc 4 Hydration Belt has a fully adjustable elastic waist belt and carries 4 Podium Arc bottles along with enough space to carry a phone, keys and an energy gel. Small fits 28-32 in, Medium 32-36 in and Large 36-40 in. Sizing note: be sure to determine if you are going to wear this on your hips or waist and measure appropriately.