Cupop / cup

This is the cup which can be opened the cap of plastic bottle easily.
This cup is designed so as to be opened easily by women, children and aged persons for plastic bottle to be closed firmly.
In surface of bottom of this cup, there is scooped silicon with saw-toothed and this makes the cap attach firmly at the bottom tapering off toward the inside.
When this cup is used, the cap of the plastic bottle can be opened more easily than existing method.