Thermos cup how to choose?

Now, how can I do without a thermos?
Nowadays, the types and brands of vacuum cups on the market are mixed. As consumers, what we need to do is to choose a type with good quality and heat preservation
A warm thermos cup with good performance and suitable for your own. What should we pay attention to when choosing a thermos cup at ordinary times? Today, Xiaobian will come
Tell you how to choose a good thermos cup handle!
First teach you - a real air insulation performance simple identification method: pour boiling water into the thermos cup clockwise cork or cup lid for 2-3 minutes
After touching the outer surface of the cup body, if the cup body has obvious warm phenomenon, it means that the product has lost the vacuum degree and can not achieve good
The insulation effect of.