I originally used them in October 2018. Today January 2019 I am leaving a 4 star review. Yes, they are airtight and perfect for storing groceries and leftovers. , or send friends home with their leftovers. I take them to work where I sometimes fall to the ground and eventually about 1 out of 3 breaks on impact. haven't experienced any problems with it so far. I also had frozen food with me with no side effects. Yes, a few lids broke before I even used them. And the older they get, the more likely they are to break down. I have the last 6 sets left and it's time to back-order. I wish they weren't so prone to cracking when dropped onto hard ground from 3ft and the lids wouldn't crack. But overall, a year and a half is a decent run for some semi-disposable food containers, which isn't entirely surprising. Hence they get a fourth star. Update - June 2021; Backordered containers (purchased shortly after initial review) appear to be more durable. I have most containers after almost daily use of a few of them. Hands down my favorite cooking container and the price is right. I no longer mind if someone breaks because it's not glassware. I think it should be noted however that this set has always been hand washed and never put in the dishwasher. I don't know if that makes them more durable.
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