Carton bottom closure

A carton blank for forming a carton, the blank comprising:

• a sheet of material having a top edge, a bottom edge and two side edges;
• at least first, second, third and fourth side panels defined by upper and lower longitudinal fold lines and a plurality of transverse fold lines;
• a plurality of top flaps located at the tops of the side panels, between the upper longitudinal fold line and the top edge of the sheet;
• a major bottom flap located at the bottom of at least two of the side panels, between the lower longitudinal fold line and the bottom edge of the sheet;
• a minor bottom flap located at the bottom of at least another two of the side panels, between the lower longitudinal fold line and the bottom edge of the sheet;
• each major bottom flap including a longitudinal exterior edge at which a closure feature is located, the longitudinal exterior edge extending substantially parallel to the lower longitudinal fold line;
• each closure feature comprising an open aperture formed by a first edge extending from the longitudinal exterior edge to a longitudinal interior edge, a notch recess, a projection, and an oblique edge extending from the projection to the longitudinal exterior edge;
• the projection being defined by an edge which extends a first distance from the oblique edge in a first direction substantially parallel to the longitudinal exterior edge, then in a second direction toward the lower longitudinal fold line, then in a third direction to the notch recess, the third direction being substantially parallel to the first direction;
• and
• the closure features being interengageable in response to erection of the blank to form a bottom closure for the carton comprising the major bottom flaps and minor bottom flaps.