A viscose towel is made from plant cellulose. It's highly absorbant, and can be wrung out upto 90% and reused straight away. It's just a matter of removing it, rinsing it in a stream, wringing it, and putting it back in place. I don't secure it to my waist. The rucksack itself keeps it in place. They are very lightweight. If you buy the XL one from PackTowl you can cut it into 3 equal pieces, each one 50cmX100cm. You can reserve one for drying your body, and the other two you can use to absorb sweat from your lumbar region, and to stuff inside your boots at night when they get wet. The XL PackTowl weighs about 375g.