Steri Pens in the Cold

Product/Skill: Gadgets/Tools/Lights   Interest: Mountaineering

When using a Steri Pen to purify your water in cold conditions, make sure you keep it warm overnight or else when you come to use it in the morning it won't work.

I suggest placing the whole pen in your sleeping bag with you that way you are ready roll first thing. I found that in the himalayas keeping the batteries alone in your sleeping bag was not enough. Also its a lot less hasle by not having to remove the batteries.

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