The SteriPEN Ultra is a perfect way to get safe water to drink via UV light. With the latest floods in Alberta, Canada, it reminds me how important clean water really is. The SteriPEN Ultra allows you to have the safety of clean water on hand when others are shelling out massive money on bottled water. The SteriPEN has you covered, no mater the situation. In just 45 sec the SteriPEN Ultra effectively eliminates over 99.9% of bacteria, viruses, and protozoa that cause water-borne illness. Although water filters work great (trust me, mine has come in handy), nothing beats instant clean water. The Ultra by SteriPEN is small, lite, and does 50 treatments on a rechargeable lithium ion battery. It also has earned the Water Quality Association Gold Seal, and is the most advanced purifier on the market. This is definitely a must-have for any adventure-minded outdoors person. Get em here.