Inner tube, whilst not great for the environment does, very much, work. So useful when in a bind, and as others have said, multi purpose.
I make my own long-burning, easy-light starters:
Fill the cups of an old cardboard egg box with sawdust (I use chainsaw chips). Pour over enough molten wax to saturate the wood and the cardboard.
Bingo.
I keep them in my tinder bag, and squirrelled into places. Pretty much waterproof too.
They're quite bulky compared to some, but a half, even a quarter, goes a long way.
You can fluff up the cardboard to take a spark and they cost almost my favourite price (free)
Waxed cotton pads work well too. But you have to buy them, and you don't get breakfast