Our family have been using these aluminium billy sets for years and they have never failed us. Can be used over the fire and also great for all types of hikes as it comes in three sizes and nests perfectly into each other. Only problem is that I have not seen it in South Africa for a very long time.
https://www.springfields.co.uk/categories/bushcraft-equipment/pots-pans/billy-can-nesting-set.html