Here's a couple other improvements to consider:

Melt the PJ with a little wax and use that to wet the cotton balls. It will set up a little firmer. (I believe this is actually what Couglan's Tinder Quicks are made from)

Tie a small piece of floss or thread around each of the balls, then stuff them into the container keeping the end of the threads draped over the lip of the container and oriented so you know which thread to pull out first. Close the lid on the threads and this will make it much easier and less mess to deal with in the field.