| 摘要 |
PROBLEM TO BE SOLVED: To provide a cup which can be detachably attached to any of PET (polyethylene terephthalate) bottles currently sold at the market without modifying structures at the bottle and a cap therefor. SOLUTION: An annular protuberance 13 in an inside diameter available for fitting to a cap 11 of a bottle 12 is formed at the bottom of the cup 10, and with the annular protuberance 13 fitted onto the cap 11, the cup 10 can be detachably attached to the bottle 12 for drinking water.
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