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Insulated Water Bottle, Stainless Steel Vacuum Cup with Handle, Thermos Flask, Double Walled Sports Travel Mug with Leak Proof Lid, Keep Hot and Cold, 12 Hours BPA Free, 15 oz, Black :
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How Thermo-flask can keep heat for a longer period of time? Everything You've Ever Wanted to Know About Vacuum Flask In 10 Simple Steps | BlogMech
My thermos flask worked fine for a few months until it suddenly stopped keeping the heat in entirely. How do vacuum flasks stop working? - Quora
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