"Amphipod® PureRun Harmony Hydration Vest: The PureRun Harmony Hydration Vest is a unisex hydration pack engineered for runners who want reliable fluid and storage capacity without the weight distribution problems of traditional vests. Its patent-pending MonoFlask™ design centers hydration up front, keeping everything accessible and balanced during daily training runs and longer efforts. The ultralight, fully breathable construction stays cool and comfortable across extended distances, with no bounce or shifting to distract you from your run.The included 355mL Soft-Tech Flask features a dual-position Spout-Lock™ Cap for secure, leak-resistant hydration access, while the front compartment keeps your phone, gels, and essentials within immediate reach. A roomy zippered compartment on the back provides additional storage for longer outings. The vest is fully adjustable for height and waist size to ensure a secure fit across a wide range of body types, and it's compatible with a 1.5L reservoir if you need to scale up your hydration capacity for extended training days.Why Our Fit Experts Love It""I took the PureRun Harmony on a hot morning run and appreciated how the front-centered design kept everything accessible without the typical shoulder and back weight. The breathable construction stayed comfortable even as I worked through tempo intervals, and the adjustable fit locked in securely without restriction."" - Sean, Road Runner Sports Fit Expert, Chula Vista, CAWho It's Best ForThe PureRun Harmony Hydration Vest is best for runners seeking a lightweight, bounce-free hydration solution for daily training, long runs, and recovery days on the road. It works well for anyone who wants easy access to fluids and essentials without the bulk and weight distribution issues of traditional hydration packs. The fully adjustable fit accommodates a wide range of body types and sizes, making it practical for most runners' training needs. VIP Family members can take the PureRun Harmony Hydration Vest for a 90-Day test drive with our Perfect Fit Guarantee."