Camelbak Circuit Vest Men's Hydration Belts & Water Bottles Graphite/Sulphur Spring : The updated Camelbak Circuit(TM) Vest keeps runners well-hydrated during long distance runs and hikes. This ultra-lightweight vest features a fixed harness with adjustable sternum straps for excellent stability and comfort while you walk, run or hike. Built-in pockets provide storage for nutrition, a phone, and other personal necessities. The self-sealing Big-Bite(TM) Valve provides convenient, leak-proof drinking. 50L total capacity. Chest Fit range: 28-50 inches. Features reflectivity throughout. Dual Adjustable sternum strap allow for an easy, personalized fit. 3D Micro Mesh throughout allows comfortable air to flow through. Built with a 50 oz CruxA(R) Reservoir that is 30% lighter and delivers 20% more water per sip. Bungy pouches on each side are fit to hold CamelbakA(R) Quick Stow(TM) or Quick Stow Chill(TM) bottles.