The Pinnacle softflask handheld features Nathan's advanced Exo-Draw 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: 18 oz / 532 mL BPA-FREE Nathan x Hydrapak soft flask with bite valve 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: 25.75oz/73g Storage Capacity: 15.25 cu in/0.25 Liters