Now this puppy will do it all:

300 mW green laser pen

This is enough juice to start a fire, enough to drive off a grizzly bear (if you're lucky, or at least blind him completely), enough to signal for help like a flare, enough to communicate line of sight to the horizon.

My buddy got a 200 mW unit, and it will punch holes through electrical tape almost instantly, pop balloons, burn a hole in your thumbnail, and ignite dry leaves and twigs. He used it to drvie off a raccoon that was after his goslings. One shot in the eyes, and the coon couldn't get out of the backyard fast enough, and ended up running into a garbage can full on.

If I had the scratch, one of the 300 mW spyders would be going in my edc and/or my bob. It could be a darned nice self defense item to boot.