I know many of you stay in hotels and don't need to pack a towel, but this is for you if you stay in hostels! Google "surf poncho!" These things are great and multipurpose. It is a towel, a bath rope, and a blanket. They can be found in microfiber that will pack small.
Bath robe? I am trying to picture something shaped like a rope that would be effective as a towel, but I am failing.
This is what they look like. Not, beautiful I admit.
Very, very flattering, if you ask me.