Abstract: A blank for forming a carton includes a unitary substrate layer defining a primary axis and a secondary axis transverse to the primary axis. The substrate layer includes: a main panel having a side edge extending substantially parallel to the primary axis and an end edge substantially parallel to the secondary axis; an end outer panel connected to the end edge by a first fold line extending substantially parallel to the secondary axis; an end inner panel connected to the end outer panel by a second fold line extending substantially parallel to the secondary axis; a side outer panel connected to the side edge by a third fold line extending substantially parallel to the primary axis; a side inner panel connected to the side outer panel by a fourth fold line extending substantially parallel to the primary axis; a notch defined in a side edge of the end inner panel; and an integral tab extending from an end edge of the side inner panel adjacent the side edge of the end inner panel.