The vessel includes a sleeve made up of foil that combines the door and the housing sealing the vessel with tea.Such a treatment of tea bag prevents it from the extraneous smells and moisture.

• 该设计原理是将茶叶放到用金属箔做成的套筒里，并结合容器和盖之间的密闭关系，防止外来气味或水分进入到水中或影响茶的原香。