A machine to sort documents, comprising: an elongated stacker section having: a first end and a second opposing end; and a first tier extending from the first end to the second opposing end, the first tier having a plurality of sorting pockets configured to store the documents (615, 617); a first magazine and a second magazine, the first and second magazines (603, 605) being positioned at the first end of the elongated stacker and including a conveyor for feeding documents onto a pickoff, which picks off one document at a time and delivers the document to a transport; a first transport operably associated with the first magazine, the first transport being configured to carry a first portion of the documents to the plurality of pockets through the first end of the stacker; the machine being characterized in that it further comprises: a first buffer unit operably associated with the first transport, the buffer unit being configured to temporarily hold the documents so as to prevent collision; a second buffer unit forming a loop around the stacker; a second transport operably associated with the second magazine, the second transport being configured to carry a second portion of the documents to the plurality of pockets through the second opposing end of the stacker; and a feeder operably associated with the first and second magazines (603, 605); wherein the feeder receives the documents (615, 617) from the first and second magazines (603, 605) so as to feed the documents to both the first transport and the second transport. an elongated stacker section having: a first end and a second opposing end; and a first tier extending from the first end to the second opposing end, the first tier having a plurality of sorting pockets configured to store the documents (615, 617); a first end and a second opposing end; and a first tier extending from the first end to the second opposing end, the first tier having a plurality of sorting pockets configured to store the documents (615, 617); a first magazine and a second magazine, the first and second magazines (603, 605) being positioned at the first end of the elongated stacker and including a conveyor for feeding documents onto a pickoff, which picks off one document at a time and delivers the document to a transport; a first transport operably associated with the first magazine, the first transport being configured to carry a first portion of the documents to the plurality of pockets through the first end of the stacker; the machine being characterized in that it further comprises: a first buffer unit operably associated with the first transport, the buffer unit being configured to temporarily hold the documents so as to prevent collision; a second buffer unit forming a loop around the stacker; a second transport operably associated with the second magazine, the second transport being configured to carry a second portion of the documents to the plurality of pockets through the second opposing end of the stacker; and a feeder operably associated with the first and second magazines (603, 605); wherein the feeder receives the documents (615, 617) from the first and second magazines (603, 605) so as to feed the documents to both the first transport and the second transport. a first buffer unit operably associated with the first transport, the buffer unit being configured to temporarily hold the documents so as to prevent collision; a second buffer unit forming a loop around the stacker; a second transport operably associated with the second magazine, the second transport being configured to carry a second portion of the documents to the plurality of pockets through the second opposing end of the stacker; and a feeder operably associated with the first and second magazines (603, 605); wherein the feeder receives the documents (615, 617) from the first and second magazines (603, 605) so as to feed the documents to both the first transport and the second transport.