Carton including detachable coupon

Claim 1

A carton assembled from a carton blank having a front panel, a back panel, and side panels, which blank as assembled has an opening closable by an end closure unit comprising: (a) a major first flap hingedly connected to the front panel along a first hinge line; (b) a second major flap hingedly connected to the back panel along a second hinge line; (c) a minor third flap hingedly connected to one side panel along a third hinge line and extending into the top opening from said one side panel; (d) a redeemable commercial information panel underlying the major flaps when closed and removably attaching to and extending from the other side panel into said opening a substantial distance; and (e) means for allowing re-closing of the major flaps; wherein said commercial information panel is removable in absence of tearing any of said first, second, and third flaps along said first, second and third hinge lines; wherein removal of said commercial information panel is accomplished without destroying the assembled carton so as to permit subsequent re-closing of said end opening; and wherein said commercial information panel can be removed and presented for redemption while said carton is being used.