Abstract: A collapsible container comprises a plastic base having four side edges, and four corners. Four plastic walls are pivotably mounted to respective side edges of the base to be swingable between erected and folded positions. A rail assembly is removably mounted to an underside of the base, the rail assembly comprising four separate plastic rail elements extending along respective side edges of the base. The four rail elements consist of a pair of first parallel rail elements and a pair of second parallel rail elements oriented perpendicular to the first rail elements. Each of the first and second rail elements extends from one of the corners to another of the corners, and is mounted by a connecting structure enabling each rail element to be separately replaced relative to the base.