I always carry what I call my "essentials kit." It has a couple of spare lighters, screws to repair my home-made external frame pack, some duct tape wrapped around a small pencil, a pocket compass, some iodine tablets, a small tarp, a needle and thread, some extra band-aids and gauze patches. So it's a combination repair kit and "extras" kit. I had to use the iodine once (on questionable water) when I inadvertently left my Aqua Mira bottles sitting in the sun and one of them exploded.
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My blog on politics, the environment and the outdoors: Haiwee.blogspot.com