Abstract: An eccentric Z-fold mailer intermediate, and mailer produced from the intermediate, offers a significant saving in mailing a customer merchandise return mailer. A sheet of paper (typically 8 1/2.times.14 inches) has first and second fold lines parallel to the top and bottom edges and dividing the sheet into first through third panels, the second and third panels of substantially the same size and shape (e.g. and a length of about 5.75 inches), and the first panel of a smaller length (e.g. about 2.5 inches). A blow on mailing label assembly, including a release liner adhesively attached to the sheet and a merchandise return label including merchandise label return tracking indicia is adhesively secured to the release liner, is provided on the first face of the third panel. A series of patterns of pressure activated cohesive, e.g. disposed in separable margin strips, hold the mailer panels together in a Z-fold configuration, with outgoing address indicia on the first face of the first panel.