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Forgot the water purifier. For many years I used the full-size Katahdyn (I suspect that's not spelled correctly) with a 10 micron First Need pre-filter (that can be backflushed in the field) on the end of the intake hose. Fairly heavy. A year ago I bought an Aqua Star Plus for about $80. It is a UV purifier like the Steri Pen but I prefer it somewhat because it is lighter and it is built into the screw top for a 1 liter Nalgene lexan water bottle.
I fill the Aqua Star bottle with water and screw on the top, activate the switch, turn it upside down in my water bottle holder, and start walking. 80 seconds later the liter of water is ready to drink. On a week-long backpacking trip I did not need to use my backup batteries---the original set lasted well past that trip. I get the 123As from Surefire at a fairly reasonable price.
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