Various implementations and configurations of a user configurable modular storage apparatus are disclosed. In an example implementation, a storage apparatus comprises: a side wall and a back wall which form an interior portion of a cabinet and an opening through which the interior portion is accessible; and a pair of slotted walls comprising pairs of slots configured to receive a storage module comprising a left mounting rod and a right mounting rod, wherein the storage module is insertable into the interior portion through the opening thereby enabling a user mounting and unmounting of the storage module to a pair of slots of the pair of slotted walls.