The present invention provides a palatable drink during the extraction, back-extraction method of conflict in the beverage preparation vessel , by improving the structure of the support sheet made of paper, to improve reliability and the bag for extracting extractable. ; between the cup holding portion of the extraction bag and its front end, the structure comprising a V-shaped structure in the second, and by separating the two parts applied to the edge of the cup, the bag for extracting retention, stability, improving extractable. ; beverage bags for the extraction of the support sheets, the upper edge, the edge of the left and right
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