A while back did some sanding on a small piece of furniture and ended up with quite a bit of sawdust. This was put into an old tobacco tin and baked on one of the burners on my gas stove.
Baked the sawdust until it was a dark black/brown.

Next sprinkled the sawdust onto a piece of red stringybark along with some crumbled white bracket fungus. This readily took the spark from flint and steel, soon was smouldering freely.

A bit of huffing and puffing soon burst into flame.

Was quite pleased with the exercise as charred sawdust is very light and easy to transport on a outdoors trip in a rucksack. The only downside is sawdust is a bit fiddly to use, care has to be taken and at a windy place the firelighting would have to be done in a sheltered spot.
Baked the sawdust until it was a dark black/brown.

Next sprinkled the sawdust onto a piece of red stringybark along with some crumbled white bracket fungus. This readily took the spark from flint and steel, soon was smouldering freely.

A bit of huffing and puffing soon burst into flame.

Was quite pleased with the exercise as charred sawdust is very light and easy to transport on a outdoors trip in a rucksack. The only downside is sawdust is a bit fiddly to use, care has to be taken and at a windy place the firelighting would have to be done in a sheltered spot.