Details Camelbak's most popular running vest has been redesigned to prioritize top level lightness and comfort. The Circuit™ Vest 50 oz 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. Material BPA/BPS/BPF Free Volume Hydration Capacity: 1.5L/50 fl oz Gear Capacity: 3.5L/210 cu in Size Fits chest size between 71-127 cm / 28-50 in Men's fit Details 3D Micro Mesh: Multi-directional air flow and cushioning to maximize comfort and breathability Camelbak Circuit Hydration Vest 50oz