Anyone have experience with one of the vacuum slow cookers? Two of the best are made in Japan by Tiger or Zojirushi. They consist of an outer vacuum insulation layer with a stainless insert which you heat on your stove. The food cooks slowly, like in a crock pot. I’ve never seen one but I think the concept goes back centuries. Heat food and then place in a box insulated by hay or shredded fabric or whatever. Some models evidently substitute foam insulation for the vacuum. I could visualize starting your evening meal after morning deer hunt and allowing it to slow cook all afternoon. No electricity required. Also would make a great ice chest for small quantities. I think they range in size from 3 or 4 quarts to 8 quarts. The heat loss would be through the lid so I think you could add conventional insulation to minimize that loss.