A container for example for a seeder includes a filling conveyor mounted on one with a bottom hopper and an upper filling spout with the conveyor being movable in a direction inwardly and outwardly relative to the side of the container to different positions relative to the container for cooperation with a supply. This is achieved by mounting the conveyor on a swivel coupling at the outer end of an arm which can be raised and lowered by pivotal movement about an inner end at the container. The hopper is supported on two pairs of ground wheels, each pair being arranged on a respective side of the hopper for supporting the respective side and each pair comprising a respective one of a pair of castor wheels mounted at respective ends of a pivotal beam extending along the respective side of the hopper and pivotal about an axis transverse to the hopper.
