One of the nice things about Bics is that they're cheap and easy to find, so it's not a big deal to have multiples of them. I have a bunch in my various kits and gear bags and then I put one in every jacket I own. I figure, if I'm going somewhere cold enough to require needing a jacket, then I should have some way to make fire with me as well, just in case. (I don't rely on it exclusively though, I also have a BSA hotspark on my keys and a magnifying glass in my wallet.)