... an interstellar hitchhiker can have.
and I have a number of non-slip towels. I love them!
I use the bubble bottom ones a lot.
I use a small one for yoga and weight training to discern which side touched the common bench, or floor.
I keep a non-bubble one in my jeep to use as a back up for yoga anywhere.
I will not use common mats ever! So if I can't always bring a mat I bring a large light weight towel. I keep a non-bubble one in my jeep that can sub as a meditation shawl, blanket, or emergency signaling device.
...any man who can hitch the length and breadth of the galaxy, rough it, slum it, struggle against terrible odds, win through, and still knows where his towel is is clearly a man to be reckoned with."Douglas Adams (1952-2001)