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A carton for containing a plurality of articles. The carton has a plurality of panels that extend at least partially around an interior of the carton. The plurality of panels include a top panel, a bottom panel, a first side panel, and a second side panel. At least two end flaps are respectively fol

A carton for containing a plurality of articles. The carton has a plurality of panels that extend at least partially around an interior of the carton. The plurality of panels include a top panel, a bottom panel, a first side panel, and a second side panel. At least two end flaps are respectively foldably attached to respective panels of the plurality of panels. The end flaps are overlapped with respect to one another and thereby at least partially form a closed end of the carton. The carton includes a handle in the closed end of the carton having a handle opening for grasping and carrying the carton. At least one end flap of the at least two end flaps has a main panel for at least partially closing the closed end of the carton and a reinforcement panel foldably attached to the main panel.

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1. A carton for containing a plurality of articles, the carton comprising: a plurality of panels that extend at least partially around an interior of the carton, the plurality of panels comprise a top panel, a bottom panel, a first side panel, and a second side panel;end flaps respectively foldably

1. A carton for containing a plurality of articles, the carton comprising: a plurality of panels that extend at least partially around an interior of the carton, the plurality of panels comprise a top panel, a bottom panel, a first side panel, and a second side panel;end flaps respectively foldably attached to respective panels of the plurality of panels, wherein the end flaps are overlapped with respect to one another and thereby at least partially form a closed end of the carton, the end flaps comprising at least one side end flap foldably attached to one of the first side panel and the second side panel, a top end flap foldably attached to the top panel, and a bottom end flap foldably attached to the bottom panel; anda handle in the closed end of the carton having a handle opening for grasping and carrying the carton,the at least one side end flap comprises a main panel for at least partially closing the closed end of the carton, a reinforcement panel foldably attached to the main panel and upwardly folded relative to the main panel to at least partially overlap the main panel, and an extension panel foldably attached to the main panel, the reinforcement panel cooperating with the main panel to form the handle;the reinforcement panel is in face-to-face contact with an exterior surface of the main panel and an interior surface of the bottom end flap, and the extension panel is in face-to-face contact with the reinforcement panel and an interior surface of the top end flap. 2. The carton of claim 1 wherein the at least one side end flap comprises a first side end flap foldably attached to the first side panel and a second side end flap foldably attached to the second side panel. 3. The carton of claim 2 wherein each of the first and second side end flaps comprises a respective main panel and a respective reinforcement panel. 4. The carton of claim 3 wherein the handle comprises a handle cutout in the reinforcement panel of the first side end flap and a handle cutout in the reinforcement panel of the second side end flap. 5. The carton of claim 4 wherein the handle comprises a handle cutout in the main panel of the first side end flap and a handle cutout in the main panel of the second side end flap, the respective handle cutouts of the two end flaps cooperate to form the handle opening. 6. The carton of claim 5 wherein the handle comprises a handle flap foldably attached to the top end flap and substantially aligned with the handle cutouts to form the handle opening, the handle flap being inwardly folded extending through the handle cutout of the main panel of the first side end flap and the handle cutout of the handle cutout of the main panel of the second side end flap, and being in face-to-face contact with the interior surface of the main panel of the first side end flap and the interior surface of the main panel of the second side end flap. 7. The carton of claim 1 wherein the extension panel is downwardly folded. 8. The carton of claim 7 wherein at least one of the extension panel and the reinforcement panel is secured to the main panel. 9. The carton of claim 1 wherein: the closed end is a first closed end;the end flaps are first end flaps that are overlapped with respect to one another to form the first closed end; andthe carton further includes at least two second end flaps respectively foldably attached to respective panels of the plurality of panels, wherein the second end flaps are overlapped with respect to one another to at least partially form a second closed end of the carton. 10. The carton of claim 9 wherein the handle is a first handle and the carton further comprises a second handle in the second closed end. 11. The carton of claim 1 in combination with a plurality of articles, the plurality of articles comprising bottles that are arranged in an upright position in the carton. 12. The carton of claim 1, wherein the main panel of the at least one side end flap is foldably attached to one of the first side panel and the second side panel. 13. The carton of claim 1, wherein the extension panel is attached to the main panel at an upper fold line that is above the handle, and the reinforcement panel is attached to the main panel at a lower fold line that is below the handle. 14. The carton of claim 1 wherein the reinforcement panel is in face-to-face contact with the interior surface of the top end flap. 15. A blank for forming a carton comprising: a plurality of panels comprising a top panel, a bottom panel, a first side panel, and a second side panel;end flaps respectively foldably attached to respective panels of the plurality of panels, the end flaps comprising at least one side end flap foldably attached to one of the first side panel and the second side panel, a top end flap foldably attached to the top panel, and a bottom end flap foldably attached to the bottom panel; andfeatures in the at least two end flaps, wherein the features are for cooperating to at least partially define a handle opening in a carton erected from the blank,the at least one side end flap comprises a main panel for at least partially closing an end of the carton erected from the blank, a reinforcement panel foldably attached to the main panel, the reinforcement panel being positioned for upwardly folding relative to the main panel to at least partially overlap the main panel, and an extension panel foldably attached to the main panel, the reinforcement panel and the main panel having respective features for at least partially forming the handle,the reinforcement panel being for positioning in face-to-face contact with an exterior surface of the main panel and an interior surface of the bottom end flap in the carton formed from the blank, and the extension panel being for positioning in face-to-face contact with the reinforcement panel and an interior surface of the top end flap. 16. The blank of claim 15 wherein the extension panel is for being downwardly folded by engagement with the top end flap when the carton erected from the blank is closed. 17. The blank of claim 16 wherein the extension panel is discontiguous with the feature in the main panel that is for at least partially defining the handle. 18. The carton of claim 16, wherein the extension panel is attached to the main panel at an upper fold line that is above the feature in the main panel that is for at least partially defining the handle, and the reinforcement panel is attached to the main panel at a lower fold line that is below the feature in the main panel that is for at least partially defining the handle. 19. The blank of claim 15 wherein the at least one side end flap comprises a first side end flap foldably attached to the first side panel and a second side end flap foldably attached to the second side panel. 20. The blank of claim 19 wherein each of the first and second side end flaps comprises a respective main panel and a respective reinforcement panel and the features comprise respective handle cutouts in the main panel of each of the first side end flap and the second side end flap, respective handle cutouts in the reinforcement panel of each of the first side end flap and second side end flap, and a handle flap foldably attached to the top end flap for forming the handle opening. 21. The blank of claim 15, wherein the main panel of the at least one side end flap is foldably attached to one of the first side panel and the second side panel. 22. A method of assembling a carton comprising: obtaining a carton comprising a top panel, a bottom panel, a first side panel, and a second side panel, at least one side end flap foldably attached to at least one of the side panels at a first end of the carton, at least one top end flap foldably attached to the top panel at the first end, and a handle formed at least in part in the at least one top end flap and the at least one side end flap, the at least one side end flap comprising a main panel for at least partially forming a closed end of the carton, a reinforcement panel foldably attached to the main panel, and an extension panel foldably attached to the main panel;folding the at least one side end flap to at least partially close the first end of the carton;upwardly folding the reinforcement panel to at least partially overlap the main panel of the side end flap during the at least partially closing of the first end to at least partially form the handle, the reinforcement panel being positioned in face-to-face contact with an exterior surface of the main panel;downwardly folding the top end flap to contact the extension panel to fold the extension panel downward to be in face-to-face contact with the reinforcement panel; andsecuring the at least one top end flap in a downwardly folded position to at least partially form the closed first end of the carton. 23. The method of claim 22 further comprising securing the reinforcement panel to the main panel. 24. The method of claim 23 further comprising securing the extension panel to the reinforcement panel. 25. The method of claim 22 wherein the at least one side end flap comprises two side end flaps. 26. The method of claim 25 wherein the handle comprises a handle flap foldably attached to the at least one top end flap and respective handle cutouts in each of the main panel and the reinforcement panel of the two side end flaps, and the method further comprises folding the handle flap into the handle cutouts to form a handle opening of the carton. 27. The method of claim 22 wherein the carton further comprises a plurality of end flaps at the second end of the carton and the method further comprises overlapping the plurality of end flaps at the second end to at least partially close the second end of the carton. 28. The method of claim 22 wherein the carton comprises a bottom end flap foldably attached to the bottom panel at the first end, the method further comprises upwardly folding the bottom end flap to contact the reinforcement panel to initiate the upwardly folding of the reinforcement panel. 29. The method of claim 28 wherein the upwardly folding of the bottom end flap positions the reinforcement panel in face-to-face contact with an interior surface of the bottom end flap.