I think the ancient technology of taking a glowing ember from one place to another and making a fire out of it needs to be relearned. As I see it, rekindling a fire with hot coals would be a lot easier than starting a fire with many other methods around.
Fire ember can be carried with the use of a fire pouch (ember held between two shells). A more modern method would be to put burning pieces of wood and hot coals into a one gallon steel paint can and close the lid. A small slot could be near the bottom and top that can be bent open or closed to adjust the air flow to allow in just enough air to keep it burning but not so much as to consume all the dry wood in the container. The gallon paint can full of these burning embers wouldn't be heavy, as the water in the wood would have already boiled away.
Any other ideas on carrying burning embers to the next encampment to start the next fire?