If I had to go out my front door just now, I think I'd probably want a lighter. I know I'd be able to get enough wood by hand to have a decent fire all night, and since I haven't yet mastered fire by friction, I'd need something to get it going, of course if 1 box of matches counts as one piece of kit then I'd take that instead. Or maybe, when I think about it, maybe just a decent sleeping bag because my already built debris shelter would keep any rain/snow off.
Longer term I reckon making some sort of cutting tool would be easier to improvise from found items whilst I learned to make fire by friction so I probably would keep the lighter.
cheers
Justin