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1. Cardboard Boxes: If the box is plain cardboard without any coatings or inks, it might be safe. However, many cardboard boxes have a wax or plastic coating, which can release harmful chemicals when heated.

2. Plastic Containers: Only use plastic containers labeled as microwave-safe. Heating non-microwave-safe plastics can release harmful chemicals into your food.

3. Styrofoam: Generally, it's not safe to microwave Styrofoam as it can melt and release harmful chemicals.

4. Paper Bags: These are usually not safe to microwave as they can catch fire.

5. Aluminum Foil: Never microwave aluminum foil as it can cause sparks and potentially start a fire.

For the safest option, it's best to transfer your food to a microwave-safe dish before heating.