The newest form fitting hydration pack, the Advanced Skin Lab Hydro 5L uses front hydration for convenience, and holds essentials for shorter endurance races with less weight and more comfort. No buckle, no straps, all the trims prevent chafing, friction for increased comfort. Light and easy custom adjustment system eliminates pressure points on the sternum area and increases breathing comfort. Instinctive, quick and easy access to your poles while running (can also be used to fix your helmet). High flow bite-activated hydration valve. PVC, Phthalate, Bisphenol-A FREE - FDA approved polyurethane.