Cards integrated into a one-way or two-way mailer for multiple uses

An envelope having integrated seperable cards formed of a single sheet of material having first and second sections, and a main fold line defining said first and second sections comprising:

• said first section forming the front of the envelope and including a top edge, side edges, and a bottom edge formed by said main fold line, said first section further comprising a non-perforated first fold line, a non-perforated second fold line, and a non-perforated third fold line, said non-perforated first fold line spaced inwardly from and parallel with at least a substantial portion of the top edge of said first section, and said second and third non-perforated fold lines spaced inwardly from and parallel with at least a substantial portion of the side edges;
• said main fold line comprising a non-perforated, non-separating portion and a perforated separating portion;
• said main fold line comprising a perforated section and a non-perforated section;
• and
• said second section, having no fold lines, and comprising a plurality of separating perforations perpendicular to the main fold line perforated, separating portion of, said plurality of separating perforations perpendicular to said main fold line and said perforated section of the main fold line defining at least one seperable card, such that when said first and second sections are folded to form the envelope the at least one seperable card forms a portion of the back of the envelope.