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Vacuum flask

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Copper plating for outer surface of inner layer of vacuum flask,Sun Glory Industry

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Review Ecovessel Perk 20oz Insulated Bottle

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LifeSky Stainless Steel Vacuum Insulated Drink Bottle Thermos - Unboxing

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KickBak Stainless Vacuum Insulated Tumbler

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Senator Vacuum Flask by Tefal

A vacuum flask is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection.