I have an issue with making charcloth in large batches - any more than a few days in this weather and I find it gets damp and becomes difficult to ignite rather than being the fire-lighters friend that it ought to be.
So I carry cloth ready to char and a short length of copper pipe. The pipe is bashed flat at one end all bar a tiny hole the other end is left round and smooth.
I use freshly made stuff to light a fire - and then make more as and when I need it - take a strip of cloth and roll it and stuff it into the pipe. When your fire is going, plunge the prepared pipe into the ground close to the fire - open end downwards so it sticks into the earth - scrape some embers around it and allow the cloth cooks away, smoking merrily. When the smoke stops you take a stick and knock the pipe out of the fire - a wad of soil & ash plugs the open end of the pipe and you allow it to cool away from the fire, covering with ash if you think it might burn away.
When it is cool, take a ranger band (piece of inner tube) and wrap it over the ends of the pipe to seal it until needed.
Freshly made charcloth every few days, minimising any moisture ingress.
ATB
Ogri the trog