DetailsKeep your water close.Pop one of the included flasks out of the CamelBak Ultra Pro Hydration Vest while you're stretching out that hamstring that always causes you grief when you run marathons. Camelbak made this vest out of stretchy ripstop and 3D mesh for well-ventilated cush that you barely feel, and the included Quick Stow flasks collapse when empty for compact storage. This vest has just enough capacity to include snacks for longer runs, and there are two additional pockets designed specifically for smartphones and rain shells.Ultralight running vest with two Quick Stow hydration flasksFlasks are lightweight, collapsible, and come with bite valvesHarness capacity suitable for food and gear3D ventilated mesh assures proper airflow Zippered pocket secures smartphonesStretch pocket stores rain shellsItem #CAM007CTech SpecsMaterial3D meshVolume3L (200cu in)Reservoir Included2 17oz Quick Stow flasksPockets1 smartphone, 1 stretchDimensions13.8 x 9.4 x 4.9inClaimed Weight6ozRecommended UserunningManufacturer Warrantylifetime