Abstract: A severable carton wall includes a substantially vertically disposed composite wall formed from a pair of overlapping panels joined along a seam, and a frangible line extending across the composite wall, traversing the seam, defining a removable upper portion of the composite wall. An extensively-weakened segment of the frangible line that substantially traverses the seam is shaped and disposed such that the extensively-weakened segment defines a notch in the removable upper portion within the seam of the removable upper portion. The extensively-weakened segment includes a pair of cut lines formed respectively in the end portions of the panels such that the cut lines define a pair of secured protrusions formed respectively from the panels and extending upwardly from the lower portion of the composite wall.