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Get idea. I often fill paper bags with sawdust and shavings. Once our fire is going and has a bed of embers and wood laid crossways on top, I then put a bag of sawdust on top. The bag burns and te sawdust drops down filling the gaps in the wood which stops he wood from burning so fast. The ends of the wood sticking out from the sawdust keeps the fire going as sawdust by itself tends to smolder. If you do this you need to be able to place the bag fairly quickly, otherwise you will have sawdust everywhere when the bag burns.