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You can keep marshmallows from sticking together in the bag by putting a little powdered sugar into the bag.
Marshmallows will keep for an indefinite time in the freezer.
Tie off your unused bag of marshmallows and store them in the freezer. They will "thaw" quickly and will be just as soft as they were when the bag was opened.
Source: My mom and aunts
By Christi from TX