Hydraulics 2.5L LT run-specific reservoir included in the dedicated sleeve with direct-zip access and hose path for easy loading Two extra-large stretch mesh soft flask harness pockets and four lower stretch mesh harness pockets keep essentials accessible (flasks not included) Vertical zippered harness slash pocket and two extra-large zippered lower hip pockets for valuables or phone Padded mesh harness and hipbelt and snap-in adjustable/removable dual chest straps provide comfort and stability Large front panel zippered compartment, two open stretch mesh side panel pockets and a stretch mesh front pocket provide enough room for extra layers and calories Tuckaway safety whistle for safety on any trail Trekking pole/ice axe attachment for a streamlined carry The women's Dyna 15, designed for your most committing trail running and race pursuits, is a formidable companion. As the miles pass by and support fades further and further into the background, you need a reliable vest pack that'll go the distance. With its 2.5-liter reservoir and ample room for food and gear, yet a slim and stable design, the Dyna 15 was designed to push the limits of what marathoners and ultra-runners are capable of. Hip and harness pockets are ergonomically located to give you easy on-the-move access to your snacks, supplements and gear without sacrificing your pace. Made with 100% recycled materials.