Providing everything needed for cleansing and purifying drinking water while camping, hiking, or traveling, this pack consists of a SteriPEN Classic handheld water purifier, a pre-filter for cleansing dirty water, a 32-ounce wide-mouth water bottle, a user's guide, and a nylon case for the water purifier. The water purifier destroys viruses, bacteria, and common protozoa. It weighs just 8 ounces with four AA, disposable batteries (not included) and purifies 16 ounces of water in 48 seconds, or 32 ounces in 90 seconds. Measuring 7.6 inches long, the purifier employs ultraviolet light (UV) to destroy the DNA of microorganisms, making them unable to reproduce and cause illness. It's effective against outdoor microbes like giardia and cryptosporidium; pathogens that cause diarrhea, dysentery, hepatitis, and Legionnaire's Disease; household germs such as bird flu, E. coli, and salmonella; staph and strep; and natural-disaster risks like botulism, cholera, smallpox, and typhoid. All that is required is to push the water purifier's button (once for 32 ounces, twice for 16 ounces), place the pen-like lamp in clear water, and stir until an indicator light turns green. The pre-filter filters particulates and debris from water, making it ready for the water purifier. The water bottle has a cap for securing water after it's been purified.