WEBBUY U-Y VACCUUM FLASK THERMOS W/CUP HOT & COLD 1.0L PLASTIC RANDOM COLOR UY-2644 Drinkware Portable Tumbler

•a container (such as a bottle or jar) with a vacuum between an inner and outer wall used to keep material and especially liquids either hot or cold for considerable periods.

•The thermos bottle, or vacuum flask, is a double-walled container with vacuum space between the walls. It was invented by James Dewar, a British chemist-physicist, in 1892. It was used at first by scientists to store vaccines and serums at a stable temperatur

•A Thermos flask is a container that is used to keep hot liquids hot and cold liquids cold. It has a double-walled construction with vacuum insulation between the walls. This makes it an ideal choice for bringing along food or drinks when you are on the go.