I bought this from Amazon for backpacking, trying to avoid the hassle of a pump unit. Steripen does everything I need. It's fast, effective, and easy to use. I have the small mouth nalgene bottles and the steripen fits snug without leaking. The only reason it doesn't get 5 stars is the battery's don't last long. Be sure to pop extras in your bag if you're going more than a couple days (or have more than two people). Cheers!
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