A bicycle inner tube cut about 1 inch wide works great for a firestarter. It’s free, can’t soak up water, weighs nothing, packs well, and burns great for a few minutes, enough to catch damp tinder.
Only problem is that it stinks, so stay upwind. Yes, it’s toxic and nasty, but it’s for emergency purposes only, not as a regular go-to fire starter. Punctured tubes are free for the asking at any bike shop.
Wrap two “rubberbands” around a lighter so you always have your flame source and firestarter together.
Wheel style lighters don’t work when wet. One solution: Cut a small square of plastic wrap, put it over the business end of the lighter, and then secure it in place with one of your rubber bands.