Best containers to keep food warm?

My husband works long hours outside in the cold and his lunch sits in his truck…what are the best containers to keep his food warm all day

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You can put hand warmers under the food in the cooler. They stay warm for along time .

Get an insulated small cooler, they’re in sporting goods at walmart, then use whatever container you want.

They make those portable crock pots maybe he can plug it in his truck

They sell a heating cooler with the dishes in it… getting my truck driver one