Is it safe to put an open empty thermos in the freezer to make cold things last longer in it? - Quora
What if I put an insulated water bottle in the freezer with room temperature water inside, will the water ever get really cold or freeze? - Quora
Iron Flask 40oz Wide Mouth Sports Water Bottle - 3 Lids, Leak Proof, Double Walled Vacuum Insulated - Dark Night : Target
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