The products are arranged in open topped containers (2,3) on a conveyor (4), which passes an identification station (5) for containers and products. The conveyor then passes under a gantry (7) to label (6) the products. Part (8) of the gantry carries automatic labelling (9,10,11) devices and can be adjusted (12,13) in height, relative to the conveyor.The height adjustment is controlled by an information system (14), connected to the identification station. The information system may also control the labelling devices, from the identification station data. This identification station may include a bar code reader (15), for codes (16) carried by the containers. Gantry height adjustment may be by actuating cylinders.