Glass cracks with normal use

The main problem is that the glass containers are not durable. Three cracked in half during a couple months of normal use. They all broke in the same way, right in half across the bottom, without being dropped. I'm now looking for something that uses real Pyrex. Otherwise, I found these lids to be effectively leak proof, including for soups and sauces. Note that the divider between the compartments does not come up to the lid, so food moves between the compartments if the container gets jostled when you carry it.

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