>>870622There is no single brand as far as I'm aware. If you visit China you will find people all over, Beijing, Shanghai, Yunnan, Xinjiang, all using these kinds of thermoses. As you can see in the picture, the plastic casing is slightly different in each of the thermoses; I suspect there are dozens of independent manufactures using the same know-how to make them in China.
In all seriousness: these things genuinely work very well. They are not designed for travel, since they are very large and only work with large corks as stoppers. Up until recently (and to this day in less urban areas) southern parts of China didn't have central heating infrastructure, even though it gets cold in winter, so owning a thermos like this is really useful for making tea or washing stuff or w/e.
