Packerware Bowl is microwafe safe.
Many bowls and plates are considered microwave safe; however, if you use the wrong dish, you could ruin both the dinnerware and the dinner.
Microwaves are convenient appliances, but there are a few precautions you should know about when it comes to your dishes. Always check to see if a dish is microwave safe before using it in the microwave.
Some containers can break, melt or scald you. Some containers can also damage your microwave, such as foil-lined containers. Microwave-safe dishes can be used to both cook and store food. Non-microwave safe containers can only be used for storage or serving.
Here's How to Tell If Something Is Microwave Safe shared by Overstock.com.
Also find out which materials are microwave-friendly, and which ones you should avoid at Real Simple.