myColdCup -- lots of people have had the idea, but this looks like a clean execution for $24
Just chill an element in the freezer overnight and put it in a vacuum thermos. Only 250 mL .. ok for kids, bu a larger version would be nice.
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myColdCup -- lots of people have had the idea, but this looks like a clean execution for $24
Just chill an element in the freezer overnight and put it in a vacuum thermos. Only 250 mL .. ok for kids, bu a larger version would be nice.
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