Big bite valves self-seals after each drink, eliminating annoying drips. Large mouth opening allows you to fill the flask easily with ice and drink mixes. Empty flask collapses and folds ultra-compact to fit in most pockets. All parts top-rack dishwasher safe. Volume indicators in ounces and milliliters for tracking hydration and adding electrolytes. Hang flask upside down for easy drainage and drying. Hydration Capacity: 17 oz / 500 ml.