| 摘要 |
<p>PROBLEM TO BE SOLVED: To make a bag stably support itself even when an amount of the content in the bag decreases.SOLUTION: A first main sheet part 11 of a flexible bag part 10 is covered with a shape retention sheet 30. The shape retention sheet 30 is harder than the bag part 10, has shape retention, and comprises a curved part 31, and a pair of joined parts 32. The curved part 31 is curved so as to project to the front side (opposite side of a second main sheet 12) toward a center part in a width direction. The joined parts 32 communicate to both ends in the width direction of the curved parts, respectively. The joined pars 32 are joined to an end 15 in a width direction of the bag part 10. A lower end part of the curved part 31 is arranged approximately at the same height as that of a lower end part of the bag part 10 in a vertical direction of the bag part 10.</p> |
