Gas Laws in a Microwaved Plastic Container

I have seen demonstrations of atmospheric pressure and the gas laws performed by first heating water inside a container (like a solvent can or an aluminum can), and then closing the container and allowing it to cool.  As the vapors inside the cooling container cool and condense, the pressure inside of the container decreases relative to the surrounding atmosphere and the container collapses.  Instead of these metal containers, one could also simply heat a water source like food inside a plastic container in a microwave oven while the lid is placed loosely on the container. As the contents of the container start to cool, the lid can accidentally seal onto the container, and the plastic container contracts.   This is a phenomenon many people have observed, lending itself to discussions of gas properties.