Patent ID: 7597480

Claim:
A fastener bag comprising: a pair of opposed flat surface portions, a pair of side surface portions located between both side edges of the flat surface portions, the side surface portions being folded inward so as to provide a gusset-type packaging bag, and a fastener for opening or closing the packaging bag located on an inner surface of one of the flat surface portions or side surface portions, fused portions located at boundaries of said flat surface portions and said side surface portions, said fused portions formed by bonding one of said flat surface portions and an adjacent side surface portion; and at least one non-fused portion located in a boundary of said flat surface portion and said side surface portion and surrounded by said fused portion, wherein said fastener comprises a male portion having a base portion located on one of said flat surface portions or said side surface portions, the base portion having a projected thread extending in a longitudinal direction, the fastener further comprising a female portion having a base portion located on one of said flat surface portions or said side surface portions, the base portion having an engaging groove detachably engaged with the projected thread to extend in a longitudinal direction, wherein the base portions of said male portion and said female portion are both bonded to a single one of said flat surface portions and said side surface portions, so that the projected thread and the engaging groove face each other, wherein a cut-tape is located between the base portion of the male portion and the base portion of the female portion on the flat surface portion or the side surface portion, and an end of the cut-tape is adjacent to the fused portion, wherein the flat surface portion or side surface portion on which the cut-tape is located has a tab portion for opening the bag at a position corresponding to at least one end in a length direction of the cut-tape by forming cut-in portions with the end of the cut-tape being the center thereof so that a portion of the cut-tape is separate from the flat surface portion or side surface portion, the tab portion located on the non-fused portion.