Abstract: A toolbox accessory system for organizing and utilizing a utility box of a truck. The toolbox accessory system comprises one or more rail assemblies attached to one or more back walls of the utility box. The toolbox accessory system comprises one or more accessory assemblies configured to selectively attach to the one or more rail assemblies. The one or more accessory assemblies are configured to selectively store tools within one or more utility boxes. The one or more accessory assemblies are attached in a vertical configuration along the one or more back walls of the one or more utility boxes. A box shell comprises the one or more back walls, a top portion, a bottom portion, two side walls, and a front opening.