Abstract: A selective outer envelope inserting system includes a multiple station inserter and a multiple outer envelope collator mechanically coupled to the multiple station inserter. The multiple station inserter includes a plurality of hoppers containing inserts. One of the hoppers contains a control piece insert. The control piece insert includes a machine readable code such as a bar code that is scanned by a scanner. The scanner is interfaced with a control such as a microprocessor that controls the various hoppers to select a variety of combinations of inserts thereby determining the contents within each envelope. The multiple outer envelope collator includes a plurality of envelope hoppers, and the envelopes in each hopper differ from the envelopes in the other hoppers. The control is interfaced with the collator to control the operation of each individual envelope hopper. Through the code on the control piece, a specific envelope may be selected for each combination of inserts.