CamelBak: A new take on a classic style. The Ultra Handheld features a 17-oz Quick Stow flask that molds to the shape of your hand. The 3D ventilated mesh material is comfortable and breathable over the long haul, and the integrated phone pocket has a zippered closure for added security. The elastic X-Grip strap system ensures a stable carry, and there's even reflectivity and an extra stretch pocket for additional gels or trash.FEATURES17oz Quick Stow flask is lightweight, collapsible and features our classic one-piece silicone bite valve for rapid hydration3D Ventilated mesh offers multi-directional air flow and cushioning to maximize comfort and breathabilityElastic X-Grip strap system lets you customize your hold and keeps the flask secure even when your grip is relaxed.Secure Phone Pocket: Conveniently located with a zipper closure for secured quick accessReflectivity: For early morning or late-night runsSmall stretch essentials pocket for extra fuel SPECIFICATIONSCOLLECTION: RunningACTIVITY: RunUSER: UnisexHYDRATION CAPACITY: 500ml/17 fl ozHYDRATION TYPE: Quick Stow™ FlaskBPA/BPS/BPF FREE: YesPACK WEIGHT: 40g/1 ozDIMENSIONS: 20 x 7 x 8 cm / 7.9 x 2.8 x 3.1 inACCESSORIES INCLUDED: Quick Stow FlaskNUMBER OF EXTERIOR POCKETS: 1