Suitable for bonk free races and long runs the camelbak circuit hydration running vest helps you stay properly hydrated while running and features 6 exterior pockets for fuel and gear an included crux reservoir with a capacity of 15l 507oz and an ergonomic handle offers an onoff lever to prevent leaks and ensures 20 more water per sip while reflective details keep you safe and visible in the dark this lightweight vest has dual sternum straps for an adjustable fit and a 3d ventilated me