Z-fold mailer with reuseable reply envelope

An intermediate for a mailer type business form, comprising:

• a quadrate sheet of paper having parallel top and bottom edges, parallel first and second side edges perpendicular to the top and bottom edges, and first and second faces;
• first and second fold lines parallel to said top and bottom edges, and defining said sheet into substantially equal-size first, second, and third panels, said first panel between said top edge and first fold line, and said second panel between said first and third panels;
• a first line of demarcation disposed parallel to said first side edge extending the majority of the dimension of at least said first and second panels parallel to said side edges, said first line of demarcation closer to said first side edge than said second side edge, and defining a flap in each of said first and second panels between said first line of demarcation and said first side edge;
• means defining an outgoing address area on said first face of said first panel, said first line of demarcation passing through said outgoing address area;
• means defining a reply address area on said first face of said second panel, said reply address area spaced from, and not intersected by, said first line of demarcation in said second panel, said reply address area between said first line of demarcation and said second side edge;
• first permanent adhesive patterns provided on at least one of said first and second panel second faces for defining said first and second panels into a reply envelope having permanent adhesive on first through third sides thereof when said first and second panels are Z-folded about said first fold line so that said second faces thereof are in face-to-face engagement;
• a reply envelope closing flap formed by said second panel flap, and having activatable adhesive on said second face thereof for sealing a reply envelope on a fourth side thereof;
• first and second lines of weakness formed in said first and second panels, respectively, parallel to said top and bottom edges and straddling said first fold line, said first line of weakness spaced from said first fold line a distance large enough to contain postal address bar coding between said first line of weakness and said first fold line on said first face, but said first line of weakness not interfering with said outgoing address area;
• third and fourth lines of weakness formed in said first through third panels parallel to and spaced from each of said first and second side edges;
• said first through fourth lines of weakness defining tear-off strips providing for ready opening of a mailer constructed by Z-folding said sheet about said fold lines;
• and
• second permanent adhesive patterns provided in at least some of said tear-off strips for holding said first through third panels together in an outgoing mailer when said sheet is Z-folded about said fold lines.