I purchased these to prepare meals for my elderly in-laws. After filling, these were frozen in a standard side by side freezer. After thawing the meals in the refrigerator for 24 hours, my in-laws would heat them in the microwave. More than half of the containers have cracked and are unusable. These are very flimsy and I do not recommend using them for the freezer. I had hoped I’d be able to reuse these for many months, but realistically, they have become one use.