Insulated vacuum flasks, also known as thermos flasks or vacuum bottles. These bottles are designed to keep beverages hot or cold for an extended period.
They are made of stainless steel and often have double-walled insulation.
The flasks are suitable for various uses, including travel, office, school, and outdoor activities like hiking or camping.
They come in different sizes and colors, with some having features like easy-grip handles and leak-proof lids.