Grayl GeoPressDrink Mix & Electrolyte Ready! Requires zero setup time and makes 24 fl. oz. of clean drinking water in a blazing fast 8 seconds (5L min) for stealth on the go filtration and purification. Covert Edition bottles discreetly provide clean drinking water anywhere on earth with unrivaled ease, speed & convenience. It's highly coveted everyday carrysip or chug, fill a hydration reservoir, fill another water bottle, or use for backcountry cooking.