| 摘要 |
The present invention relates to an expandable packing device applied to a paper holder, a portfolio, a diary, a PP file or the like. The expandable packing device includes a first sheet, a second sheet kept extended from a first edge of the first sheet, a first expandable part disposed between the first sheet and second sheet, a third sheet kept extended from a second edge of the first sheet adjacent to the first edge, a second expandable part disposed between the first sheet and the third sheet, wherein the second sheet and the third sheet are kept spaced with the first sheet and secured with each other, so as to form an expandable holding space with the first sheet.
|
