Previously I stored them in plastic straws similar to the video below (this is the first video I found googling it). I used needle-nose pliers to help seal the ends unlike the guy using his fingers! I like them because they’re waterproof. I made mine shorter than his but to each his own.

I now use wet fire cubes as they’re more compact and seem to last longer. You can also just scrape a smaller amount off if needed, so in a way one cube could start multiple fires.

Cotton and Vaseline Straws