| 摘要 |
A plastic bag which is made by fusing a material film to have an upper opening portion. A zipper is provided on an inner surface of the opening portion, and the zipper has a groove formed on a base tape and a ridge formed on another base tape, the groove and the ridge being capable of engaging with and disengaging from each other. At least the base tapes are colored differently. The base tapes respectively have parts which serve as flaps, and the flap parts are of different widths. Thereby, the opening portion of the plastic bag has a step.
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