In 1876 William Irwin Martin published the Stationer's Handbook. He worked for the Samuel Raynor & link Association in New York. He oblige the first exchange sizes of envelopes and simply numbered them from 0 through 12.

An envelope is a packaging product, regularly made of planar material such as critique or cardboard, and investigated to contain a flush object, which in a postal-service context is especially a letter, card or bills. The traditional type is false from a sheet of paper cut to in succession of three shapes: the rhombus (also referred to as a lozenge or diamond), the short-arm cross, and the kite