The ornamental design for an endloadcarton with closure system, as shown and described.
FIG. 1 is an upper perspective view of an end load carton with a closure system according to our new design;
FIG. 2 is a top plan view of the end load carton of FIG. 1 with the closure system in an initial closed condition with an upper flap of the carton sealed to a lower flap;
FIG. 3 is a bottom plan view of the end load carton of FIG. 1;
FIG. 4 is an elevational view of a main panel of the end load carton of FIG. 1;
FIG. 5 is an elevational view of an opposing main panel of the end load carton of FIG. 1;
FIG. 6 is an elevational view of one side panel of the end load carton of FIG. 1, with an opposing side panel view being a mirror image thereof; and,
FIG. 7 is a top plan view of the end load carton similar to FIG. 2 but with the closure system in a re-closed condition.