Frensel lense, for many reasons. find small splinters, read fine print, or just read if glasses are lost for some, fire starting.

signal mirror, if away from city.

small disposable baking tin (actually aluminum) they fold flat and can be uesd to boil water. the mini loaf is the smallest. Or you canuse heavy duty aluminum foil for makning a water boiling container.

If laws permit something in the way of a fixed blade, refered to as a bushcraft knife or Mora type pukko.

I just finished readding Build the Perfect Survival Kit by John McCann and found lots of sound advice, and sparked even more ideas for my own stuff.

By the way Welcome!

-Joe