Side-gored bag having a first zipper tape with an area of increased thickness and with an area of progressively reduced thickness

A side-gored bag comprising:

• a first panel film forming a front panel;
• a second panel film forming a rear panel;
• a pair of V-members forming side gussets, wherein upper edges of said V-members are situated so as to be downwardly displaced by a distance w from upper edges of said first panel film and said second panel film;
• a zipper device including a first zipper tape having a first meshing rib and a second zipper tape having a second meshing rib,
• wherein said first zipper tape has a first meshing rib, which first zipper tape is bonded in a horizontal position to both said V-members and said first panel film over an area of said first panel film which extends by a distance of W, wherein W>w, from said first panel's upper edge in such a manner that both a lower side of said first zipper tape and said first meshing rib thereof are situated below said upper edges of said V-members so as to cover an upper part of each V-member, and wherein said second zipper tape has a second meshing rib which second zipper tape is bonded to said second panel film in such a manner that said second meshing rib is aligned with said first meshing rib;
• and
• wherein an area adjacent to an upper side of said first zipper tape is increased in thickness as compared with a remaining area of said first zipper tape and an area adjacent to said lower side of said first zipper tape is progressively reduced in thickness toward said lower side, and said first meshing rib is situated in said area adjacent to said lower side of said first zipper tape,
• and wherein upper and lower regions of said second zipper tape are reduced in thickness to upper and lower sides thereof.