Abstract: A two-way envelope includes front and back panels having a portion removable to open the two-way envelope with the other portion forming a reply envelope having an end closure flap for closing the reply envelope. The two-way envelope is preprinted with a reply address, a bar code corresponding to the reply address and an identification code indicating the presence of the bar code. After the two-way envelope is opened and the reply envelope closed, the reply envelope includes the reply address, bar code and identification code but not the outgoing address of the two-way envelope.

Abstract: A two-way envelope includes front and back panels having a portion removable to open the two-way envelope with the other portion forming a reply envelope having an end closure flap for closing the reply envelope. The two-way envelope is preprinted with a reply address, a bar code corresponding to the reply address and an identification code indicating the presence of the bar code. After the two-way envelope is opened and the replay envelope closed, the reply envelope includes the reply address, bar code and identification code but not the outgoing address of the two-way envelope.

Abstract: A mailing envelope that has a closure flap and is provided with lines of perforations that divide the envelope into separable two portions, one of which is usable as a mailable envelope. The perforations are spaced from edges of the envelope so that the envelope resists inadvertent breaking along the lines of perforations during stuffing and handling during mailing.

Abstract: Stationery including a snap-open envelope having perforations arranged so that an end portion separates from the remaining portion to expose the contents. The remaining portion provides a return or reusable envelope having an end closure flap which, when the return envelope is closed, may cover a portion of the front panel of the original envelope, with a portion of the original back panel of the original envelope becoming the front panel of the return envelope. The snap-open envelope can be of the pasted type having front and back panels die cut or perforated from different paper sheets with the panels pasted together to form the envelope and with an insert or information sheet between the panels. This envelope can be processed by high speed data processing equipment including computer driven printing.

Abstract: Stationery including a snap-open envelope having perforations arranged so that an end portion separates from the remaining portion to expose the contents. The remaining portion provides a return or reusable envelope having an end closure flap which, when the return envelope is closed, may cover a portion of the front panel of the original envelope, with a portion of the original back panel of the original envelope becomming the front panel of the return envelope. The snap-on envelope can be of the pasted type having front and back panels die out or perforated from different paper sheets with the panels pasted together to form the envelope and with an insert or information sheet between the panels. This envelope can be processed by high speed data processing equipment including commputer driven printing.