<p>A method and system for aiding a filling of a mail sack (19) with mail items (14) cause the mail items (14) to fall into a receiving opening (31) of an intermediate guide device (13). Within the intermediate guide device (13), the trajectory of the falling mail items is influenced (14) to obtain a predetermined orientation of the plane of the mail items (14) during their descent from an output opening (32) of the intermediate guide device (13) towards the mail sack (19) positioned below said output opening (32).</p>
