Works fine and without plastic

Buy for not using plastic. Use for the microwave. It works perfectly well and heats the food. Once heated, the walls are very hot and I have to use a glove. The cover is well thought sides (top is pulled to allow steam to escape. I spend the lid in the dishwasher to a mode to 50 degrees and no deformation or problem (perhaps indicating that comments deformation problems with many programs warmer).
Although tight, but if we put it in a bag, carry it flat is a wise precaution.
The possible quantity is more than well for a big eater (style a big big tin can).
I have a rectangular one, and I find the round shape more convenient.