The camelbak quick stow chill running water flask offers a capacity of 500ml 17oz and has been designed to provide instant refreshment when on the go its insulated design keeps beverages cold 2 x longer and for easy refill the flask has extra wide mouth the bite valve self seals after use to prevent annoying drips whereas for tracking hydration and adding electrolytes there are volume indicators in oz and ml once empty the flask collapses and folds ultra compact to fit in most pockets