5. Takeout Containers

Some takeout containers contain plastic but even the paper ones sometimes have metal handles. Play it safe and switch your leftovers to something else before you nuke ’em.

6. Butter and Yogurt Containers

We all love storing leftovers in these handy containers, but don’t heat them in them. They’re made of thin plastic that’s meant for one-time use, so they really don’t mingle well with the microwave.