Easily transform water from lakes, rivers, and bogs into drinkable water with the GRAYL 16.9-oz. UltraPressA(R) Purifier. Compact, discrete, and ridiculously easy to use, the UltraPressA(R) Covert Edition fits into any pack pocket or cup holder, requires zero setup, and makes 16.9-oz. of clean purifier water in a blazing fast 10 seconds (3L/min). Award winning OnePress global protection is effective on all 7 continents and empowers adventurers and travelers to drink from the world's sketchiest water sources. Simply Fill. Press. Drink. Stealth on-the-go filtration and purification is perfect for the hiker, backpacker, hunter, or global adventurer seeking discretion and fast-flow purified water for drinking, filling hydration reservoirs, or cooking. Purify in 4 Easy Steps 1) Grab the FlipCarry Handle with one hand and the Outer ReFill with the other, then pull apart. 2) Fill with dirty water. Scoop from a stream or lake, or fill from any bathroom sink or rustic hostel tap. 3) Vent and Press: Twist SimpleVentA(R) cap 1/2 turn (to allow air to vent) during purification process. Utilizing body weight, press with steady downward force. 4) Drink purified water. Makes clean, purified drinking water in 10 seconds (3L/min.) Removes all waterborne pathogens, including viruses, bacteria (e.g. E. coli, Cholera, Salmonella, Dysentery) and Protozoa (e.g. Giardia, Cryptosporidium, Amoebae) Compact size fits into any pack pocket, or cup holder Ultra-powdered activated carbon filters particulates, and adsorbs chemicals, pesticides, herbicides, flavors and odors Replaceable purifier cartridge rated for 300 cycles (40 gal. / 150L) RiverFlow spout delivers a fast-flow of clean drinking water for chugging, filling hydration reservoirs and other bottles FlipCarry handle rotates 90Adeg for effortless separation of inner press from outer refill) Multi-functional SimpleVent drink cap protects spout from cross-contamination SoftPress