Made from a big water bottle wrapped in several layers of cardboard. The whole thing is covered with brown paper, which makes the surface harder and look nicer.
The lid is made from 4 layers of cardboard and trimmed to tightly fit the container. When used, it’s covered in a plastic bag for waterproofing
Shaping cardboard to tight tolerances is pretty easy: when dry it is suprisingly stiff; you can cleanly saw it through with a serrated knife, even at tiny shallow angles. You can also add more layers of paper to make it thicker.
I did think of insulating my big pot too, but I don’t use it very much. One time I made a big pot of spaghetti sauce for freezing and now I still haven’t finished eating it.
Yeah there is that too, would need a lot of freezer tubs. I also don’t have space for a microwave to reheat them. Some stuff could go in the air fryer, or a saucepan.
My partner really doesn’t like eating stuff that has been frozen though. I think she gets it from her parents, they are really funny about it for some reason. They appear to think “best before” means “toxic after”.