Steri Pen Mini Traveler Handheld UV Water Purifier is the smallest, lightest & easiest to pack Steripen for travelling & camping. Weighing just 103g (3.6oz), the Steripen Traveler Mini fits neatly into your checked luggage, carry-on baggage or rucksack. It might be smaller, but you still get all the speed, power & effectiveness of larger Steripens. Steripen Traveller Mini water purifier creates ultraviolet (UV) light that disrupts the DNA of microbes in seconds. Without functional DNA, microbes can't reproduce or make you sick. The Steripen Traveller Mini is proven effective against risks like Cryptosporidium, Giardia, E.coli, Salmonella, Viruses & bacteria. The Steripen Traveller Mini purifies a half-liter of water in 48 seconds, just like the bigger models