| 摘要 |
PROBLEM TO BE SOLVED: To achieve additional improvements such as a new attempt for securing the safety of children attending school along with a loess weight and a less production cost of a knapsack. SOLUTION: A woven fabric using reproduced yarns from polyethylene terephthalate bottles is employed for a front section 1, a back section 2, a bottom gusset 5, side gussets 4 and 4, an upper flap 3, and the like replacing leather or synthetic leather in view of environmental preservation. This achieves a less weight and a less production cost. For improving ease of use, reflectors 3a, 4a, 4a, 10a, and 10a are mounted on the upper flap 3a, side gussets 4 and 4 and shoulder straps 10a and 10a to avoid the danger of traffic accidents during attending school by the children. A string for keeping housed articles from being popped out of an opening part of a housing case is attached to prevent the falling of the housed articles or other various new attempts are worked out. |
