Adding a lightweight, loose-fitting long sleeved top to your pack can really pay off too. I used mine a few weeks ago as an extra layer of clothing to fight the chill in cold airplanes, and I used it again today as a towel to wipe sweat out of my eye after putting it on to protect me from the bugs and sun after getting a little too pink on my shoulders on a long bike ride. I have used it as a sling in the past, and it can stand in for a bandana in many other situations too, especially id yours is made of cotton. (Mine isn't, but is a button-up with a couple of pockets.)