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My thermos' weak spot is the lid. How should I store it for optimum heat retention? - Quora

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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

My thermos' weak spot is the lid. How should I store it for optimum heat retention? - Quora

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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