| 摘要 |
PURPOSE: A housing bag for a lunch box is provided to prevent leakage from the lunch box or the infiltration of outdoor air inside the lunch box, and cover the lunch box with reducing gaps around the sides of the lunch box of which the size is smaller than a predetermined size. CONSTITUTION: A housing bag for a lunch box includes a rectangular sheet body(9) and a protruding part(11). The protruding part is formed at the rear of the long edge side of the sheet body, and is capable of covering the sides of the lunch box. The other side of the sheet body is folded back toward the long edge, so that the protruding part is a peripheral wall for covering the lunch box. The protruding part is sewed on the rear surface of the sheet body, and then is formed into a polygonal shape which is symmetric against the central line in a long edge direction. An opening(10) in contact with the sheet body is freely opened and closed when the peripheral wall protrudes. |
