The disclosure defined by this invention is of a shelving system where the top and bottom shelf positions are fixed relative to each other by a plurality of support columns, and one or more inner shelves are vertically positionable by hand. The support columns pass through guide channels in a shelf, or in brackets attached to the shelves, and are forced to bend slightly to do so. The channels are larger than the support columns. The bent support columns exert opposing lateral forces against a shelf at the guide channel walls and edges and the friction between the support columns and the guide channels enables a shelf to remain stuck in a position even when under load. Force can be applied by hand to overcome the stuck position and slide a shelf to a new vertical position. Inner shelves can be finely positioned thru a finite vertical range.