That looks good. They sell similar things commercially but as silly prices. I got an insulated carrying bag and the plastic pots, which if I wrap a towel round them will do rice, but I cant imagine them doing a casserole.
That looks the business and would be light and easy to store, squeezing in amongst other things and stopping them rattling
I have started boiling water for my coffee in the microwave, much easier and quicker than faffing with the kettle and the gas stove, which must have a noisy extractor fan put on before lighting.