| 摘要 |
PROBLEM TO BE SOLVED: To resolve the problem of a conventional technique that causes difficulties in opening an opening part of a gusset bag widely because side gusset parts are folded in piles and fused with a zipper when opening the opening part, and in taking out contents because an open area of the opening part is small when taking out the contents.SOLUTION: A gusset bag with all four sides sealed, formed of a packing material such as a plastic film, is provided with a zipper made of plastic all around a surface part 2, a back part 5, and side gusset parts 6 inside an opening part 1 provided to the upper part of the gusset bag. |
