Thermos Vacuum Insulated Tumblers, 2 pieces, JCY-320 Unused, but please purchase only if you understand that they have been stored at home. Please check the photos for details. The History of Thermos ＜THERMOS＞ comes from the Greek word for heat. In 1904, they were the first in the world to commercialize a glass vacuum flask, and named the brand ＜THERMOS＞. Since then, Thermos products have spread worldwide, to the point where people say "Thermos for vacuum flasks." In 1978, they also developed and released the world's first "lightweight, unbreakable" high-vacuum stainless steel vacuum flask, and now, as the world's largest vacuum flask brand, they are used in homes in over 120 countries.