The present invention relates to a system for sorting flat objects in particular of postal items comprising a first tray which comprises first compartments accessible by a front face of the first compartment, which are intended to receive the flat objects standing on their edge and / or flat, and a second compartment (4) mounted on said first compartment (1), said second compartment being operated vertically between a high position, in which the second compartment is disposed at the top of the first blocks of the first compartment, in front of the front face (1a) of the first compartment, and a low position in which the second rack has a second compartments (40) arranged in front of the first blocks of the first compartment, accessible by a front face (4a) of the second compartment for receiving the flat objects stacked flat.
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