Lightload Towels are extremely light and very useful.  They are quick drying, very absorbent, washable, reusable, and biodegradable.  This is the small size, which is 12" x 12" and weighs about 0.25 ounces.

-Wipe off sweat when hiking

-Dry off after swimming

-Use as a pot holder

-Use as a fire starter when everything else is wet

-Use as a napkin

-Use to wash/dry dishes

-And so much more