The camelbak ultra handheld chill comes with 17oz 500ml quick stow chill flask to keep your water cold twice as long as normal bottles and features reflective details for safety during early morning or evening runs for a customized hold there is a secure elastic strap system and the handheld offers 3d ventilated mesh to maximize comfort and breathability it is lightweight and functional and provides easy access to your phone thanks to a zippered phone pocket plus for extra fuel the hand