Abstract: A plurality of continuous plys are superposed to comprise the top and bottom panels of a mailing envelope having insert panels therebetween, and, in one modification, having a record panel overlying the top envelope panel. Each of the panels which collectively comprise the stuffed envelope assembly are of the same size, and means are provided for enabling the envelope to be opened concurrently with the removal of an upper edge of each of the insert panels thereby providing an access to the central, removable portion of the insert panels which portions are secured along their respective side and bottom edges to marginal portions of the insert panels, said marginal portions being fixedly secured to corresponding marginal portions of the envelope-defining panels.