What??? No one mentioned a bandana? It's a:

Wash cloth

Snot rag

Bandage

Water filter

Ankle brace

Towel

T.P. in a pinch <img src="/forums/images/graemlins/blush.gif" alt="" />

Neck shade

Cooling system

Pot holder (cooking pot that is)

Tie for converting hiking poles to shelter poles

Some even have maps printed on them. I'm sure I missed a few uses. I always carry at least two.

Errr....better not to use one as T.P.and a water filter <img src="/forums/images/graemlins/wink.gif" alt="" />
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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.