A system for transporting, handling and/or storing goods, in particular piece goods in wholesale and retail trade, with • stackable receiving containers, each having a base, a peripheral side wall and an upper opening, for receiving goods during transport and/or during storage, the receiving containers each having stacking structures in the region of their base, which, in cooperation with counter-structures formed in a region of an upper edge of the side wall facing the upper opening, permit a positively locking stacking of receptacles one on top of the other within one plane of the base, • at least one roller transport unit having a setting-up surface for at least one receptacle and rolling means (7, 8) on an underside opposite the setting-up surface, the setting-up surface having receiving structures corresponding to the stacking structures for setting up a receptacle with positive locking within a plane of the setting-up surface, characterised by • at least one locking bar having two longitudinal ends (14, 15) and being adjustable, in particular telescopically, in its length connecting the longitudinal ends (14, 15), wherein a first holding structure for connection to an upper edge of a receiving container is provided at a first of the longitudinal ends of the locking bar, and wherein a second holding structure for connection to a receiving container is provided at a second of the longitudinal ends of the locking bar, in particular arranged on the underside, counter structure is provided on the roller transport unit, wherein the locking bar has a releasable fixing mechanism for limiting the length of the locking bar set to a selected dimension to the selected dimension. • stackable receiving containers, each having a base, a peripheral side wall and an upper opening, for receiving goods during transport and/or during storage, the receiving containers each having stacking structures in the region of their base, which, in cooperation with counter-structures formed in a region of an upper edge of the side wall facing the upper opening, permit a positively locking stacking of receptacles one on top of the other within one plane of the base, • at least one roller transport unit having a setting-up surface for at least one receptacle and rolling means (7, 8) on an underside opposite the setting-up surface, the setting-up surface having receiving structures corresponding to the stacking structures for setting up a receptacle with positive locking within a plane of the setting-up surface, characterised by • at least one locking bar having two longitudinal ends (14, 15) and being adjustable, in particular telescopically, in its length connecting the longitudinal ends (14, 15), wherein a first holding structure for connection to an upper edge of a receiving container is provided at a first of the longitudinal ends of the locking bar, and wherein a second holding structure for connection to a receiving container is provided at a second of the longitudinal ends of the locking bar, in particular arranged on the underside, counter structure is provided on the roller transport unit, wherein the locking bar has a releasable fixing mechanism for limiting the length of the locking bar set to a selected dimension to the selected dimension.