I don't think I'm the only one around who uses Altoid tins to carry notions in my knitting bag. I've also used the tins from York chocolate covered mints, and Hershey's truffles.
The other day at the store, I ran into M&M tins that are being sold for the holidays. They look something like the attached image down below (the image is actually of m&m bowls, but they're the same shape as the tins).
They're really handy to carry tools around and they're darn cool.
Edit: I took a couple of pictures of mine with the cellphone. The tins fit in the palm of your hand.