CamelBak: A dream for ultra-long distance runners and fast-packers, Zephyr™  Vest is engineered with body mapping for optimal ventilation and designed to perform for your specific pursuit. It’s lightweight and maxed out with safety features. There’s a secure cell phone pocket, built-in safety whistle, and attachment point for your trekking poles. Hydration at the ready with two Quick Stow™ flasks at the front of your vest for easy access. And since you’re always on the run, the ultra lightweight material is treated with Polygiene® antimicrobial to keep bacteria at bay from one stretch to the next.FEATURESEngineered Knit Mesh: Light and breathable material made with body mapping technology to ventilate areas of the body that generate the most heatDual Adjustable Sternum Straps: Offers a range of adjustments for a custom fit and increased stabilityFuel and Gear Storage: Multiple stow options, easily accessibleSecure Phone Pocket: Keep essentials safe and easy to accessReflectivity: For low light safetyStretch Overflow Pocket: Quickly stash or shed an extra layerTrekking Pole Attachment: Easily attach and remove poles when neededPolygiene® Anti-MicrobialSafety Whistle: Be heard in case of an emergencyReservoir Compatible, not includedDual Exit Tube RoutingMade with Ultra Light Materials SPECIFICATIONSCOLLECTION: RUNACTIVITY: VESTSUSER: UnisexHYDRATION CAPACITY: 34 ozHYDRATION TYPE: (x2) 17oz Quick Stow Flask Standard 2.0BPA/BPS/BPF FREE: YesQUICK LINK DISCONNECT: NoGEAR CAPACITY: 11L/670 cu inPACK WEIGHT: 200g/7ozDIMENSIONS: 39 x 27 x 15 cmBACK PANEL: Engineered KnitNUMBER OF EXTERIOR POCKETS: 8