I have been reading backwards in the forum (have already covered 100+ pages) and just came across a signaling mirror thread which I was about to respond to. Since I saw this thread as I logged in I will add it here.

I carry as a signaling mirror an old rectangular, ladies' makeup compact. You can use it as is or you can drill (carefully) a hole in the center for sighting. Not only is it almost breakproof since it is in the compact, but I toss a bunch of fire tinder in the compact as well. I use cotton balls (100% cotton) either with or without vaseline. These will also ensure that the mirror doesn't break if dropped.

It is virtually breakproof; it is a real mirror, not metal; It is lightweight & slimline; it is a tinder holder or it can be used as a complete micro kit, and best of all (as I try to do with as much improvised equipment as possible) it is free! Why buy when you can make it free and many times come up with a better product?

Just my $.02 worth...

Soarn