How Long Does Tupperware Last?

Each type of plastic container is made differently, so there’s no standard guide for how long you can keep yours around. But here's what the expert has to say.

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I was gifted a bunch of Tupperware when I last moved. One of them is very odd. It has triangles that poke up into the inside. Bottom side looks like an ice cube tray. I use it for items that fat will drop off of. What is this for? : r/whatisthisthing

How many years can we use tupperware bottles? - Quora