a storage module for flat postal items includes a storage area , an infeed function to transfer postal items from a stream of postal items into the storage area , and an extraction function to extract postal items from the storage area . the infeed and extraction function have a common roller conveyor unit and a feed stop . the infeed function guides the postal items in a direction of travel of the roller conveyor unit from the roller conveyor against the feed stop for a transfer into the storage area . the extraction function extracts the last stacked postal item from the storage area in the direction of travel of the roller conveyor unit through an extraction opening . the storage area includes a separating knife to exert a first pressure and a second pressure .