Adventure ready water purifier bottle UltraPress Covert Edition now has a boost! All bottles ship with a One-Way Valve pre-installed making it possible to add electrolytes, drink mixes and other flavored liquids directly into an UltraPress. Drink-Mix & Electrolyte Ready! Compact, discrete, and ridiculously easy to use — the 16.9oz UltraPress® Purifier Bottle fits into any pack pocket (or cup holder), requires zero setup, and makes safe, great tasting drinking water in a mere 10 seconds (3L/min). On-the-go filtration and purification for the hiker, backpacker, camper, emergency prepper or global traveler seeking fast-flow purified water for chugging, filling hydration reservoirs, or cooking. Simply—Fill. Press. Drink.™ No more single use water bottles The UltraPress is the perfect survival and travel water filter and water bottle in one. Adventure ready, take the portable UltraPress water bottle on your next adventure and create your own safe drinking water on the go.