Abstract: The invention is a process for manufacturing plastic zipper bags. In the process, zippers are disposed along both opposing edges of a pair of contiguous elongate plastic sheets. The elongate plastic sheets are then divided into individual bags by sealing the two plastic sheets to one another along spaced-apart transverse sealing lines. By these steps, the pair of elongate plastic sheets are transformed into a strip of plastic bags comprising a plurality of individual plastic bags attached to one another along abutting transverse sealing lines. Each plastic bag along the strip of plastic bags has a zippered upper edge and a zippered lower edge. Next, the upper edge of every other plastic bag along the plastic bag strip is sealed with a sealing edge disposed parallel to and proximate to the zipper along the upper edge. On each of the other bags along the plastic bag strip, the lower edge is sealed with a sealing line disposed parallel to and proximate to the zipper along the lower edge.