Lots of plastic containers for left over food claims to be microwave friendly. There are several pre-made food products on the market with plastic containers t

Lots of plastic containers for left over food claims to be microwave friendly. There are several pre-made food products on the market with plastic containers that instructs you to cook them in microwave with the plastic packaging still on. One product I tried recently even had a little tab on the plastic wrapper that would start whistling when the food was done. I think I tried it that one time. I don't usually buy things like that.