Seriously, get a head lamp. It allows you to light your path and have both hands free. Or have light on whatever it is you need while having both hands free. Say, if you fall and hurt yourself and need both hands to treat the wound and night is falling. You can get headlamps at LL Bean, Rei, and every other outdoors store.
If you want to be really anal, you can get a steripen. They use UV light to purify water and are the size of a pen. Light weight, easy water filtration.
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