Abstract: A continuous band of containers containing two rows of containers with each row joined to an opposite edge of an elongated joining strip, is produced by positioning a flattened elongated tube of plastic heat sealable material so that it is centered with respect to the longitudinal center-line of an elongated reinforcing sheet. The width of the flattened tube equals twice the height (H) of each container plus the width "d" of the joining strip. The longitudinal edge portions of the reinforcing sheet are folded inwardly over the longitudinal edges of the flattened tube to be separated by distance "d". Aligned transverse welds, each of length H, are then made to extend inwardly from opposite longitudinal edges of the flattened tube and weld two layers of the folded tube together with two layers of the reinforcing sheet. Each pair of aligned welds is spaced from the next pair of aligned welds by distance "L" equal to the container width.