A shelf system comprised of a wooden post of rectangular cross section and fastened to a wall. The post has a plurality of parallel holes (41) which are spaced in the longitudinal direction of the post and extend perpendicular to the post side-surfaces (51). A bracket (1) has provided at one end a generally U-shaped aperture or recess which fits the post (2). The flanges/legs (11) of the aperture or recess include holes which can be aligned with the post holes (41) when the bracket is horizontal and the bottom surface (12) of the aperture supports against the front surface (50) of the post. A securing pin can be inserted through the flange holes (13) and a post hole (41) such as to secure the bracket to the post.