Not strong at all. The lids are quite fragile and break easily. The bowls seem to be more durable and I haven't had any problems with the bottom breaking, but even with 10 ounces of chicken on the small side and 14 ounces of veggies on the large side, the bowl folds in half and almost just lifts on either side on instead of the middle. Bowls serve their main purpose, they store ready meals. They are brittle and break easily, and the lids crack and break so easily that washing them without breaking them is almost a joke.
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