Abstract: A document carrier envelope is particularly useful for protectively transporting checks being returned from an institution on which the check was written to the institution at which the check was deposited. The envelope is of opaque stock, thereby preserving confidentiality of the return check. The envelope is imprinted with coded indicia indicating specific financial data suitable for high speed processing. The envelope front and back panels are joined in facing contact along the margins of three edges, thereby reducing entry of air into the envelope and eliminating fouling the processing machinery. The envelope flap is notched to receive a letter opener, and the flap fold line is perforated, thereby contributing to high speed handling.