From Cookipedia

Lock&Lock boxes, similar to Tupperware boxes

Tupperware is the brand name of a home products line that includes preparation, storage, and serving products for the kitchen and home, which first introduced in 1946.

In today's common parlance, the term "Tupperware" — much like the brand names "Kleenex" and "Band-aid" — refers to an entire class of products, not only the original brand to which it denotes and first belonged to. Typically, the word is used to signify any plastic storage container for the kitchen, not only Tupperware branded products.

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