CamelBak: Our most popular running vest is now lighter and more comfortable! Updated for 2019, the Circuit™ Vest includes a 1.5-liter CRUX reservoir that delivers 20% more water per sip and is lighter weight for additional comfort. With a more streamlined dual sternum strap adjustment system, that also has integrated reflectivity, and a new 3D Micro Mesh, the Circuit is lighter, more comfortable and better ventilated. The secure zippered pocket fits most smartphones and the open front harness pockets are specifically designed for Quick Stow™ flasks should you need additional hydration. A one-size-fits-most design means you can use it for a variety of activities and thanks to the side compression being highly adjustable it ensures a stable fit over any terrain.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 accessTube Trap: Keeps your drink tube secure and easily accessibleDual 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 runsUltra Light Materials: Unrivaled breathability, comfort and durability SPECIFICATIONSCOLLECTION: RunningACTIVITY: RunUSER: MenHYDRATION CAPACITY: 1.5L/50 ozHYDRATION TYPE: CRUX™ Reservoir with Quicklink™ SystemBPA/BPS/BPF FREE: YesQUICK LINK DISCONNECT: YesGEAR CAPACITY: 3.5L/210 cu inPACK WEIGHT: 160g/5 ozDIMENSIONS: 35 x 19 x 9.5 cm / 13.8 x 7.5 x 3.7 inFITS TORSO: Fits a chest size of 71-127 cm/28-50 inNUMBER OF EXTERIOR POCKETS: 5