Soymilk can be put in stainless steel cups. If you put hot soy milk that has just been cooked, it is very hot to be exact, then there is no problem at all. While the temperature is still high, pour directly into the thermos cup, and be sure to cover it tightly. This is equivalent to forming a sealed, airless, high-temperature environment, in which bacteria are basically killed, you can rest assured. If it is leftover warm soybean milk, it is really easy to breed bacteria. If it's only a few hours, don't worry too much. But if you want to keep soybean milk for a longer time, you must first soak the thermos cup in boiling water, rinse it once, kill the bacteria that may exist in it, and then pour soybean milk. Not only soybean milk, but also milk, various soups and water you want to put in a thermos cup. Extended data:

Soybean milk is a traditional drink of Han nationality in China, which was made by Liu An, the king of Huainan in the Western Han Dynasty. Soak soybeans in water, grind, filter and boil. Soymilk is nutritious and easy to digest and absorb. Different from western milk, soybean milk is a kind of food with national characteristics in China, which is very popular all over China.