5 things?
Hmmm ... what's in my kit right now.
Steel
Flint
Tinder Fungus
Charclothe
Inner Bark of the Cedar tree - shredded
I guess that's 5 (or at least I ran out of fingers counting on one hand)
But I often have either tinder fungus or charclothe but not both - depending upon the situation. And sometimes I have a piece of birch bark or a short chunk of well-worn rope in there to help with the shredded Cedar bark.
I do have one of those ferro-cerrium and magnesium block fire starters around here somewhere, but I never carry it. I just use it for show-n-tell demos. And the magnifing lense is packed in with the ... other ... gear, and gets used more for splinter removal than fire starting.
So, for "tinder" I generally just carry that shredded inner bark of the Cedar tree.
Works for me. Other's mileage may vary.
Mikey - yee ol' grumpy blacksmith out in the Hinterlands