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I was a taught as a child that one should never put metal in a microwave. And, after I accidentally scorched the interior of my Mom's microwave from a forgotten fork, I've not questioned the rule since.
Turns out, it depends. If you avoid the following, you can safely use metal containers in a microwave:
1. Metal objects with thin, sharp edges (forks, twist ties, crumpled foil).
2. Multiple metal objects.
3. Metal with deep dents or scratches.
There are in fact metal containers that are marketed as "microwave safe", such as these containers from Black and Blum:
https://blackblum.com/products/meal-prep-box-set-x5
These IKEA containers aren't marketed as microwave safe, but field reports suggest they are safe in a microwave:
https://www.ikea.com/gb/en/p/ikea-365-food-container-with-lid-rectangular-stainless-steel-silicone-s49437509/
Here's a good explainer video (with links to the scientific literature):
Turns out, it depends. If you avoid the following, you can safely use metal containers in a microwave:
1. Metal objects with thin, sharp edges (forks, twist ties, crumpled foil).
2. Multiple metal objects.
3. Metal with deep dents or scratches.
There are in fact metal containers that are marketed as "microwave safe", such as these containers from Black and Blum:
https://blackblum.com/products/meal-prep-box-set-x5
These IKEA containers aren't marketed as microwave safe, but field reports suggest they are safe in a microwave:
https://www.ikea.com/gb/en/p/ikea-365-food-container-with-lid-rectangular-stainless-steel-silicone-s49437509/
Here's a good explainer video (with links to the scientific literature):
▶ Watch on YouTube