An attachable panel assembly includes a replacement panel having a mounting panel and a closure panel projecting from the mounting panel. The closure panel has an attachment portion and a removable zipper tear strip disposed between the attachment portion and the mounting panel. The panel assembly also includes a first adhesive layer disposed on the mounting panel and a second adhesive layer disposed on the attachment portion of the replacement closure panel, the first adhesive layer and the second adhesive layer being disposed on opposing sides of the replacement panel. A resealable carton system includes the panel assembly attached or attachable to a carton body of a carton assembly by means of the first adhesive layer. The carton assembly can be sealed by closing an inner closure panel of the carton assembly and folding the replacement closure panel so that the second adhesive binds to the inner closure panel.