Flask, 17 oz Capacity, Brown, Plastic, Hang Flask Upside Down for Easy Drainage and Drying, Volume Indicators in Ounces and Milliliters for Tracking Hydration and Adding Electrolytes, Empty Flask Collapses and Folds Ultra-Compact to Fit in Most Pockets, Bite Valve Self-Seals After Each Drink, Eliminating Annoying Drips