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 ; a first magazine and a second magazine , the first and second magazines 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 ; wherein the feeder receives the documents from the first and second magazines 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 ; 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 ; a first magazine and a second magazine , the first and second magazines 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 ; wherein the feeder receives the documents from the first and second magazines 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 ; wherein the feeder receives the documents from the first and second magazines so as to feed the documents to both the first transport and the second transport . <EOS>