Advantages of soapstone are that it doesn't melt (like grease pencil) or turn to powder (like chalk). I used to use it doing road markings- I'd pretty much forgotten about it.

Oh, and Wildman, I've got you beat- my bed roll and kit live in my trunk. :P
_________________________
-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.