A collapsible container, comprising: a base, a first pair of opposed walls, and a second pair of opposed walls, the first pair of opposed walls and the second pair of opposed walls defining an opening in the top of the container, wherein the container further comprises at least one stacking member which, when the container is erect, is movable between a stacking position in which the stacking member is positioned to support the base of another container thereon and a filling position in which the stacking member is removed from the opening in the top of the container, wherein the container further comprises at least one locking element for securing the at least one stacking member to the container, wherein the at least one stacking member comprises an elongate bar and two legs at the extremities thereof, wherein the at least one locking element is provided at one end of at least one of the legs, wherein the at least one locking element comprises a protrusion for engaging with the container, and wherein at least one of the second pair of opposed walls comprises at least one receiving aperture for receiving the at least one locking element, the receiving aperture provided to receive the protrusion of the at least one locking element, and characterized in that the protrusion of the locking element is oval in shape, wherein, upon insertion or removal of the locking element from the receiving aperture, the longest dimension of the protrusion is parallel to the longest dimension of the receiving aperture, and, when the stacking member is moved to adopt the stacking or filling position, the stacking member is rotated such that the protrusion is no longer parallel to the receiving aperture. a base, a first pair of opposed walls, and a second pair of opposed walls, the first pair of opposed walls and the second pair of opposed walls defining an opening in the top of the container, wherein the container further comprises at least one stacking member which, when the container is erect, is movable between a stacking position in which the stacking member is positioned to support the base of another container thereon and a filling position in which the stacking member is removed from the opening in the top of the container, wherein the container further comprises at least one locking element for securing the at least one stacking member to the container, wherein the at least one stacking member comprises an elongate bar and two legs at the extremities thereof, wherein the at least one locking element is provided at one end of at least one of the legs, wherein the at least one locking element comprises a protrusion for engaging with the container, and wherein at least one of the second pair of opposed walls comprises at least one receiving aperture for receiving the at least one locking element, the receiving aperture provided to receive the protrusion of the at least one locking element, and characterized in that the protrusion of the locking element is oval in shape, wherein, upon insertion or removal of the locking element from the receiving aperture, the longest dimension of the protrusion is parallel to the longest dimension of the receiving aperture, and, when the stacking member is moved to adopt the stacking or filling position, the stacking member is rotated such that the protrusion is no longer parallel to the receiving aperture.