Abstract: A portable shelf for mounting on an existing, conventional, wall affixed towel bar using only friction and gravitationally induced forces. The shelf is capable of holding sundry articles customarily found in a bathroom while also providing a bar that may be used to hold towels. The shelf is preferably formed from two brackets pierced by multiple rods preferably of uniform cross-section. More than two brackets may be used resulting in a shelf that has enhanced stiffness. The brackets have a side appearance resembling the capital Greek letter gamma with a vertical back that conforms to the wall, a top that is pierced by multiple rods lying in a horizontal plane, a bottom pierced by at least one rod that is spaced from the wall, and a front that extends downward from a point in front of the towel bar to a point that is behind the towel bar and closer to the wall. The shelf's width may be adjusted by sliding the brackets on the rods.