I always find room to carry a couple of chem lights... guess it's from my younger days out on the Gulf of Mexico at night...

possibly a folding saw to process wood if you had to make a splint or firewood if for some reason you had to remain overnight....

a good fixed blade like a Grohmann #4

I'm really impressed after upgrading my SureFire 6P with a Malkoff drop in, possibly a small 123 powered high output light...