A cable storage system includes a box and at least one cable retainer. The box includes a plurality of walls at least partially defining a box interior. The box receives a cable from an exterior of the box. At least one wall of the box defines a retainer opening. The retainer is adapted to receive an unsecured length of the cable and may be selectively secured to the retainer opening. When the retainer is secured to the retainer opening, the retainer extends out of the interior of the box. Multiple retainers may be used to store additional lengths of cable.