For more information on the SteriPEN mini water purifier, check out: http://stp.me/SteriPENWaterPurifier
Perfect for backcountry treks and international travel, SteriPEN's Traveler mini water purifier kills 99.9% of bacteria, viruses and protozoa in a half-liter of water in 48 seconds with a touch of a button.
For more great deals on great brands, check out: http://stp.me/home
+Soldier53flyer We took the SteriPEN on the John Muir Trail and a set of batteries lasted us about 1 week with average water consumption before we needed to replace them. We were out for 14 days and got by on 4 of the batteries. It's best to have a few more than you think you'll need. Let us know if you have any further questions. Thanks! :) - Chris