The present application relates to fluid filled pouches arranged in a row. The fluid filled units comprise elongate, heat sealable, face and back layers that are jointed together at a side edge, and by transverse seals to form pouches. The pouches are filled with fluid and are sealed at a split edge, defining fluid filled units. The fluid filled units can be separated along transverse lines of weakness. The transverse lines of weakness are defined by perforations, including perforations nearest the split edge that are shorter in length than perforations that are spaced further from the split edge and extend toward the side edge.