Lightweight and rugged waistpack offers easy access 50 fl. oz. Antidote� reservoir features a welded center baffle and low-profile shape for stability Air-light wide-mouth port cuts weight and makes it easy to fill and clean the reservoir; quick-snap cap tightens in just a quarter turn External zip pocket secures keys and other small essentials Mesh hipbelt and Velvetex™ back panel allow cooling air circulation CamelBak FlashFlo hydration waistpack features reflective highlights on the front and back that increase your visibility in low light