This is one of the most useful tool for an hitchhiker: a permanent marker. Possibly with a big felt tip, so that you can write fast and you don't need to pass it 5 times. But the biggest is not always the best. This is the marker we bought in a Chinese shop in Spain: after a few days of usage the ink started to fade out. We were surprised thinking it was full of ink. So Otilia tried to open it and surprisingly this was the sad reality: it's completely empty! Just a big roomy container, that is protecting nothing, like a package of chips that looks huge but after you open it it's just air! The ink was just in the tip, only appearance, a perfect metaphor of our society.