Special envelopes

Special envelopes are for items that will not fit a standard envelope. A kraft paper B4 mailer, 250×353 mm, takes A4 documents together with their covers, and C3 takes even larger contents. Gusset B4 envelopes and mailers expand to 20 or 40 mm thick, enough for a catalogue, a thick set of contracts or a book. Brands are Bong, Postac and Besmile.