A towel, it says, is about the most massively useful thing an interstellar hitchhiker can have. Partly it has great practical value. You can wrap it around you for warmth as you bound across...
Greetings hitchhikers! Hang on to your towels as you gaze up longingly at Alpha Centauri and remember those days when the small furry creatures were really small furry creatures and 42 was really 42.