Clean drinking water is a necessity when you're backpacking or traveling, which means this Grayl UltraPress Purifier - Nature Edition is an essential part of your packing list. With its ability to purify water in ten seconds, you can have fresh, clean water to drink in no time. The ultra-powdered activated carbon absorbs dangerous particles and removes waterborne pathogens. No setup is involved. All you have to do is fill the UltraPress® with water and press. Replace the purifier cartridge after 300 cycles to ensure you're getting the cleanest water possible.