We need to design a seal for Zippos that allows them to function normally, but prevents rapid evaporation of the fuel when unused. I know about the piece of inner tube trick, but a little gasket might be just the trick.
I've been working on my pocket survival kits when I have time, I've incorporated several of the ideas given in this thread, along with some found on YouTube videos. This one isn't compete, it needs a compass and a few more things.
So far I have fire straws, carbide tool sharpener that works great for striking the fero rod, fish hooks, fishing line, waxed thread, heavy duty needle, swiss+tech multi tool, sandpaper, gorilla tape, banding material arrowheads, can opener, and ESEE survival card.
These fire straws are made with pixie stick straws, they hold a whole cotton ball with petroleum jelly, and will burn for two minutes. The banding material arrowheads were easy to make and take up very little room.