A reconfigurable modular storage system has a reconfigurable support for storage units of the storage system. The reconfigurable support includes an end frame member attachable to the storage unit in two reverse orientations and releasably attachable base members. When the end frame member is attached to the storage unit in a first orientation and the base members are unattached, a portion of the end frame member serves as a raised end railing of the storage unit. When the end frame member is attached to the storage unit in a second orientation and the base members are attached, the base members serve as a load-bearing supports for the end frame member and for the storage unit. Multiple end frame members may be vertically stacked to create multiple vertically stacked storage units.