As others have said, these are the same containers that many Chinese (and other) takeout restaurants use to hold their food. They're not fancy, nor pretty, but they do the job great. My favorite things about them are that all three sizes use the same lid, and you have no guilt for throwing them away when the contents go bad in the fridge. They seal very well and don't leak as long as the lid is put on correctly. I've had mine for almost a year and still have three-quarters of them left, probably a quarter of the lids haven't even been used. Highly recommend.
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