Abstract: A shelving system has a plurality of support posts and one or more shelf assemblies, each shelf assembly having a height adjustment mechanism. A height adjustment mechanism can include a bracket attached to a shelf portion, wherein the bracket includes a channel for receiving a support post, and a latch element pivotably attached to the bracket. The latch element pivots between a first position in which the latch element engages an aperture in the support post to support the shelf assembly on the support post, and a second position in which the latch element is out of the aperture to allow the shelf assembly to move along the support post. The latch element can include a hook with a notch positionable to receive an edge of the aperture, and a side face positionable to rest or press against the support post.