Abstract: A post for racking comprises a front wall (2), and first and second side walls extending rearwardly from each longitudinal side of the front wall, the front wall having a longitudinally extending trough (7), and a first and a second series (5, 5') of spaced apertures (15) on opposite sides of the trough (7). Each side wall comprises a front wall portion (3, 3'), and a second side wall portion (4, 4'), with the two portions joined by an inwardly inclined portion (11, 11', 13 13'). The post is interchangeable with a number of posts having different load bearing capabilities. This is achieved by ensuring that the distant b separating outer faces (25) of the trough (7) from the outer faces (26) of the adjacent side walls are the same for all posts in the range.