A drying device for drying foldable containers for transportation and storage, wherein the containers comprise in each case at least one bottom wall (2.B) and at least one side wall (2.S), wherein the side wall (2.S) is connected in an articulated manner to the bottom wall (2.B) such that the container is configured to be convertible from a folded state into an unfolded state, wherein in the folded state the side wall (2.S) is arranged substantially parallel to the bottom wall (2.B) and in the unfolded state the side wall (2.S) is arranged substantially perpendicular to the bottom wall (2.B), wherein the drying device comprises - a treatment chamber having at least one holding device which is arranged in the treatment chamber and a rotation unit which is arranged in the treatment chamber, - a feed unit which is arranged in a feed plane, wherein the feed unit conveys the containers in a feed direction to the treatment chamber and delivers the containers to the treatment chamber in the folded state and - a discharge unit which is arranged in a discharge plane, wherein the discharge unit conveys the containers in a discharge direction away from the treatment chamber, wherein the containers are delivered from the treatment chamber to the discharge unit in the unfolded state, wherein the rotation unit comprises an axis of rotation running substantially in the horizontal direction, wherein the at least one holding device is configured and designed such that it can be brought into contact with the container exclusively in the region of the bottom wall (2.B), wherein the holding device fixes the container in its position by exerting a holding force acting in the plane of the bottom wall (2.B). wherein the containers comprise in each case at least one bottom wall (2.B) and at least one side wall (2.S), wherein the side wall (2.S) is connected in an articulated manner to the bottom wall (2.B) such that the container is configured to be convertible from a folded state into an unfolded state, wherein in the folded state the side wall (2.S) is arranged substantially parallel to the bottom wall (2.B) and in the unfolded state the side wall (2.S) is arranged substantially perpendicular to the bottom wall (2.B), wherein the drying device comprises - a treatment chamber having at least one holding device which is arranged in the treatment chamber and a rotation unit which is arranged in the treatment chamber, - a feed unit which is arranged in a feed plane, wherein the feed unit conveys the containers in a feed direction to the treatment chamber and delivers the containers to the treatment chamber in the folded state and - a discharge unit which is arranged in a discharge plane, wherein the discharge unit conveys the containers in a discharge direction away from the treatment chamber, wherein the containers are delivered from the treatment chamber to the discharge unit in the unfolded state, - a treatment chamber having at least one holding device which is arranged in the treatment chamber and a rotation unit which is arranged in the treatment chamber, - a feed unit which is arranged in a feed plane, wherein the feed unit conveys the containers in a feed direction to the treatment chamber and delivers the containers to the treatment chamber in the folded state and - a discharge unit which is arranged in a discharge plane, wherein the discharge unit conveys the containers in a discharge direction away from the treatment chamber, wherein the containers are delivered from the treatment chamber to the discharge unit in the unfolded state, wherein the rotation unit comprises an axis of rotation running substantially in the horizontal direction, wherein the at least one holding device is configured and designed such that it can be brought into contact with the container exclusively in the region of the bottom wall (2.B), wherein the holding device fixes the container in its position by exerting a holding force acting in the plane of the bottom wall (2.B).