Though there are general guidelines when it comes to microwave safe containers, there are always exceptions. If you aren’t sure whether something can go in the microwave, check the back or bottom to look for a microwave safe label. If you can’t find one, try to determine what the item is made of – this will give you a better idea if it’s ok for microwave use. If you can’t tell what a container is made of, just remember – when in doubt, leave it out. It’s the best way to ensure that your microwave will stay in top shape for years to come.