26770 - Envelopes, all types & Materials
2677010 - - Envelopes, Commercial, Clasp & String-and-button types, incl Mailing
2677021 - - Envelopes, Commercial, White or Colored mailing, except clasp & String-and-button types
2677022 - - Envelopes, Commercial, Kraft mailing, except clasp & String-and-button types
2677040 - - Envelopes, Commercial, all other Types incl Padded shipping envelopes
2677XX0 - - Envelopes, all types & Materials
2677XX2 - - Envelopes (Miscellaneous : Speciality )