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Coffe or red tea will always remains besmirch in the cup. It will sometimes make trouble for cleanning if the deapth of cup is too much.
A little zipper may solve this trouble.Made by Shape memory plastic, this cup have enough softness to connect itself by a zipper.
When we want to clean the besmirch which settled at the bottom of the cup, just open the zipper and wash like a piece of cloth.
South China Agricultural University