A shelf organizer including an elongated rail member defining a channel section. The rail member includes inwardly extending legs to which are attached longitudinally extending rubber beads. A connector forming part of a shelf divider is disposed in the channel section and when the divider is located in a vertical position it will be retained in position by the beads. The divider can be readily twisted out of engagement with the beads and quickly moved to a different location with minimal effort to vary the widths of the bind whenever desired. A single bead secured to the upper or lower legs may be used in place of two beads. Also the mounting flange may include an integral portion forming a ledge that engages the bead to help retain the divider in a vertical position.