CamelBak: Now with additional features and lighter than ever before, the Ultra™ Pro Vest is even better for long distance training and racing. Available in multiple sizes and equipped with two Quick Stow™ flasks, the Ultra Pro continues to put comfort above all else. Made with our new 3D micro-mesh, the updated Ultra Pro offers increased comfort and ventilation, additional front and back reflectivity, simplified dual sternum strap adjustability and a removable safely whistle. It also includes even more front cargo storage for easy access to fuel and a secure zippered pocket for your phone. The stretch overflow pockets have been updated for easier access to extra layers or essentials and it can accommodate a 1.5L reservoir for longer self-supported runs.FEATURES3D Micro Mesh: Multi-directional air flow and cushioning to maximize comfort and breathabilitySecure Phone Pocket: Conveniently located with a zipper closure for secured quick accessTrekking Pole Carry: Easily remove or replace poles while runningDual Adjustable Sternum Straps: Offer a range of adjustments for a custom fit and increased stabilityFuel and Gear Storage: Organize run essentials with pockets specifically designed for Quick Stow flasksReflectivity: For early morning or late-night runsStretch Overflow Pocket: Quickly stash a shed layer or rain shellSafety whistle: Extra assurance in case of an emergency SPECIFICATIONSCOLLECTION: RunningACTIVITY: RunUSER: MenHYDRATION CAPACITY: 1L/34 ozHYDRATION TYPE: Quick Stow™ Flask (x2)BPA/BPS/BPF FREE: YesGEAR CAPACITY: 6L/360 cu inPACK WEIGHT: 160g/5 ozDIMENSIONS: 40 x 29.5 x 21 cm / 15.7 x 11.6 x 8.3 inFITS TORSO: Fits a chest size of: S 71-86 cm/28-34 in M 81-101 cm/32-40 in L 96-116 cm/38-46 inACCESSORIES INCLUDED: 2 Quick Stow flasksNUMBER OF EXTERIOR POCKETS: 13