In this day, fans of Douglas Adams carry a towel publicly with them. This is in remembrance of the author and his famous book The Hitchhiker's Guide to the Galaxy, also known as H2G2. In this book, author demonstrated the importance and usefulness of a towel with world famous phrases and caption.
If you want to survive out here, you gotta know where your towel is
Don’t panic and carry a towel
A towel is about the most massively useful thing an interstellar Hitchhiker can have
Any man who can hitch the length and breadth of the galaxy, rough it, slum it, struggle against terrible odds, win through, and still know where his towel is is clearly a man to be reckoned with
Only those of us who do not know where our towels are, would ever notice, that the cool people know where their towels are
H2G2 Books Cover
Hitch Hikers Guide