Neat trick:
Take a drinking straw (I like the ones from Chick Fil-a)
Pinch the end with a pair of needle-nose pliers and melt it with a small flame (candle, lighter, etc.)
Cut straw off just a bit shorter than the inside length of the container you want (I have a bunch of them in my altoids can PSKs), like the inside of your firekit.
Smear up some cotton balls and stuff them (in pieces works fine) into the straw - pack them down tight with a stick or something.
Crimp and sear the other end of the straw.
Make as many as you like... wipe off the "tinder tubes" and put them in your firtekit.
When you want to use them, cut/tear/bite off the end and squeeze out however much PJCB you need to get the job done. You can even re'seal the packet if so inclined, or make 1 per PJCB - whatever.
I've also stored an all-weather match and 2 birthday candles in a couple of them - can store all sorts of stuff in these little "capsules".