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More seriously though, isn't the deal with face masks that you want them to be disposable, because at some point you've got to take them off and put them somewhere.
They're disposable because they made from things that aren't easily cleaned. Invent a face mask that can be washed time and time again at 90oC and still filters out particles as small as viruses and you'll be on to a winner.
Get home, stick tupperware container in a dishwasher on an 80oC wash, wash hands.
That's not the reason why it doesn't make much sense.
Greenbank
An excellant example. More seriously though, isn't the deal with face masks that you want them to be disposable, because at some point you've got to take them off and put them somewhere.
A tuperware will presumably make it back to her house, infecting her when she removes it.