User Review: SteriPEN Adventurer
Price Paid: $72
The SteriPen meets all EPA standards for health - that should be enough. I have a friend who never filters water, and he hikes the same areas I do, and he never got sick with no treatment at all. So anything I say about how effective it is will not help. BUT the EPA seems to think it's great.
Fantastic usability - I can put the 3.5 ounce thing on my belt, then take out a water bottle and have a fresh liter in a minute and a half without even taking off my pack. I don't see a better way. If you find good water, there is no need for a prefilter - my bandanna does just fine.
By the way I backpack lightweight - 20 to 30 pounds in the Sierras.