I always have at least one, gallon sized freezer bag in my bag of tricks. If someone it tossing more than a gallon of cookies, their either contagous or someone will think they are and start a panic.
As for the mask, any N95 and Vicks vapor rub. That will keep things out, and kill your sense of smell for a while.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.