| 摘要 |
A packaging box assembly includes a base plate, a middle plate set and a cover plate. The base plate has a central wall, and a plurality of lateral walls extending from the central wall. The lateral walls are foldable along fold lines to define a receiving space with the central wall. The middle plate set is placed within the receiving space and is changeable between a cushioning position in which the middle plate set is parallel to the central wall, and an assembled position in which the middle plate set is perpendicular to the central wall. When the middle plate set is in the cushioning position, the cover plate is placed on top of the base plate. When the middle plate set is in the assembled position, the cover plate is placed on the middle plate set. Thus, various modular configurations are formed to change the size of the box assembly.
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