| 摘要 |
The backpack (1) has an enclosure formed by an envelope (3) comprising a back wall, a front wall and two side walls (6a, 6b). The front wall includes vertical folding zones (18a, 18b) allowing side wall portions (17a, 17b) to-be-folded back on a central wall portion (16) and to-be-fixed together in order to bring the backpack in a low volume folded position and a large volume unfolded position. The central and sidewall portions include reinforcement layers (19, 20a, 20b) to locate the folding zones between the central wall portion and one of the side wall portions. |
