A coupling device for coupling containers includes a body part having a fastening piece and a cam part on upper and lower parts thereof, and a planar coupling plate between the upper and lower parts. The fastening piece is fastenable to an upper corner piece in a corner of a container by rotating the body part around its vertical axis. The cam part controls the motion of the body part and receives substantially vertical forces between the containers. The body part includes a first rotating locking part for preventing and/or releasing the motion of the body part, and a second rotating locking part for enabling and/or preventing lateral motion of the body part. The second locking part is in direct or indirect contact with the first locking part so that when the first locking part rotates, the second locking part also rotates, enabling a locking mode or an unlocking mode.