Carbonated beverages, beer, sparkling water

Gas expansion in a confined space can easily cause the cup lid to open and result in splashing, posing a safety risk.

Dry ice, liquid nitrogen

It will generate high pressure and pose a high risk of explosion. It is strictly prohibited to put it into a thermos.

Strong tea, Chinese medicine, milk, soybean milk

Long term sealed storage can easily breed bacteria, deteriorate and emit odors, while also producing stubborn tea stains, corroding the inner container, and shortening the lifespan of the cup.

High salt and high acid soup

Long term storage can corrode the stainless steel inner liner, causing blackening and rusting of the inner wall.