Abstract: An adjustable-length shelf which may be removably mounted in an enclosure, such as a locker cabinet. The shelf is adjustable between a semi-collapsed position to facilitate placement of the shelf within the enclosure and a deployed position for supporting a load at the desired vertical height. The shelf includes a first section having first gripping surface for frictionally engaging one of the enclosure sidewalls, a second section pivotably coupled to the first section, and a third section releasably coupled to the second section and having a second gripping surface for frictionally engaging the other of the enclosure sidewalls.