I have a large homemade ash tray I use for coals. The top part has holes in it, so ash falls down to the bottom part which does not get hot easily and allows the coals to burn out. It hold quite a bit actually, I have at least 5 sessions worth of ash in there right now (3-4 coals per session) and there's plenty of room to keep dumping the ash/coals
. Originally made for cooking, but I got them cheap from the goodwill. Then I also have a pringles can I put used shisha, ash, and foil into once finished with a session.