Packtowls are a common backpacking item and available at multiple locations. Examples are REI
. They must be used to be believed. You can wash and wring them out, then use immediately. Being synthetic they dry very rapidly. They contain a handy snap loop and can be dried around the shower head, shower vent or on an awning bar. I'd recommend nothing more or less than the 20" x 45" size. Two of them hold me for a very long time -- one for hair/face and a second for body. I've posted about them at least twice before. Good reminder, Antique Pedaler!