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Traditional vacuum cup has small cup rabbet, so it is inconvenient to clean the cup, especially the bottom of the cup.
The top and bottom of the vacuum cup in this design have rotating caps. The caps at both ends can be unscrewed during the cleaning. And it is very easy to clean up the cup for no dead space exists.
Besides, people can drink water from both ends of the vacuum cup, so this cup is more convenient.
Zhjiang University of