The invention relates to a shelf support (8) for chaotically storing especially small packages, such as packages used in a pharmacy. Said support comprises shelf bottoms (32) that respectively represent plane bearing surfaces (34). Each shelf bottom (32) contains a plurality of parallel guiding grooves (35) in which slides (40) can optionally be inserted. Said slides (40) are used both to mechanically remove gases in which the medicament packages can be stored, and as driving elements (42) for pulling the medicament packages off the bottom of the shelf. In this way, the width of one such gas can be modified at any time, by inserting the slide (40) into other guiding grooves (35).