The Pinnacle Soft Flask Insulated 18oz Handheld features NATHAN(R) advanced ExoDraw soft flask technology in an updated carrier and grip-free strap for unmatched comfort. It boasts an expandable pocket for keys and essentials, ideal for marathons, trail runs, hikes, climbs, and more. With an insulated flask, keep fluids cooler, longer. Design: Lightweight, ergonomic mesh strap contours to your hand for a comfortable, no-grip fit The 3D soft flask bottom optimizes storage and minimizes size, collapsing as you hydrate for easy handling and storage The small, wrap-around pocket with an elastic opening easily stores essentials like keys or nutrition 18oz/532mL BPA-FREE Insulated Soft Flask with bite valve, keeps fluid cooler longer Proprietary soft flask interior rigid ExoSpine(TM) creates superior hand feel and support Ergonomically designed hand strap for grip-free comfort Breathable wicking mesh strap for maximum comfort Small expandable stash pockets for gels, keys and other small essentials Soft flask can be easily removed from sleeve Additional Details Weight with soft flask: 3.35oz/95g Storage Capacity: 15.25cu in/0.25L