The seal performance of a Double Layer Coffee Mug(https://www.aijunware.com/product/vacuum-flask/coffee-mug-straw-mug-beer-mug/) is a crucial feature, especially for consumers who carry beverages on the go. This type of mug typically includes an inner and outer wall, often made from stainless steel or high-quality plastic, to provide insulation and maintain beverage temperature. The sealing mechanism, however, depends largely on the lid design, gasket material, and the precision with which all components fit together. A well-designed mug must prevent leaks even when shaken, tilted, or stored in a bag.