I use old-tshirts, because i have lots of it( and i don't wear jeans). Fold it, if you need a bigger ember. I store them in old 35mm photo canisters. Free and waterproof. It works, but not as a primary firelighting option. But needed if you want to play with tradition flint and steel.
A Ferroisum rod and some cottonballs with petroleum jelly, is way easier and more reliable.
_________________________