A lifting device and a hook-lift container, the lifting device being attached at one end of the container, and the lifting device comprising: - an undercarriage provided with one or more wheels, the undercarriage being adjustable between at least a raised position and a lowered position, and the undercarriage being arranged, in the lowered position, to carry at least part of the weight of the container, wherein - the lifting device further comprises a tow bar being adjustable between an erect position and an unfolded position, the tow bar being provided with a hook connection element on its side facing away from the hook-lift container in the erect position of the tow bar, the hook-connection element constituting a connection point for a hook-lift truck, the tow bar being connected to the undercarriage; - the lifting device includes a sliding rail arranged to be locked at least in a upper position and in a lower position, corresponding to the raised position and the lowered position, respectively, of the undercarriage; characterised in that: - the undercarriage is arranged to be brought from the raised position into the lowered position by means of manual force and/or gravity, the undercarriage being arranged to be brought from the raised position to the lowered position when the end of the container has been lifted above the supporting surface; and - the hook-lift container is provided at the end with one or more support legs adjustable between a raised position and a lowered position, where the support leg(s) in the lowered position is/are adapted to carry at least a portion of the weight of the hook-lift container. - an undercarriage provided with one or more wheels, the undercarriage being adjustable between at least a raised position and a lowered position, and the undercarriage being arranged, in the lowered position, to carry at least part of the weight of the container, wherein - the lifting device further comprises a tow bar being adjustable between an erect position and an unfolded position, the tow bar being provided with a hook connection element on its side facing away from the hook-lift container in the erect position of the tow bar, the hook-connection element constituting a connection point for a hook-lift truck, the tow bar being connected to the undercarriage; - the lifting device includes a sliding rail arranged to be locked at least in a upper position and in a lower position, corresponding to the raised position and the lowered position, respectively, of the undercarriage; characterised in that: - the undercarriage is arranged to be brought from the raised position into the lowered position by means of manual force and/or gravity, the undercarriage being arranged to be brought from the raised position to the lowered position when the end of the container has been lifted above the supporting surface; and - the hook-lift container is provided at the end with one or more support legs adjustable between a raised position and a lowered position, where the support leg(s) in the lowered position is/are adapted to carry at least a portion of the weight of the hook-lift container. - the undercarriage is arranged to be brought from the raised position into the lowered position by means of manual force and/or gravity, the undercarriage being arranged to be brought from the raised position to the lowered position when the end of the container has been lifted above the supporting surface; and - the hook-lift container is provided at the end with one or more support legs adjustable between a raised position and a lowered position, where the support leg(s) in the lowered position is/are adapted to carry at least a portion of the weight of the hook-lift container.