It comprises carrying means (20) for carrying at least one object (300) and release means (30) for releasing at least one object (300) such that the object (300) is unloaded from the respective carrying means (20). The carrying means (20) comprise at least one housing (25) for receiving objects (300) and having one opening (26) through which the object (300) can be loaded into or unloaded from the respective housing (25). The release means (30) are adapted to allow at least one object (300) to be selectively unloaded from any of the housings (25).