Abstract: A toolbox with a built-in-roll-top tonneau cover for installation within an open cargo bed of a pickup truck. The toolbox in one configuration is a rectangular shaped tool-box having in combination a cigarette lighter adaptor and a roll top tonneau cover. The roll-top cover is rotatably mounted and secured within a concealed rear portion of the tool box. A special lock mechanism secures the cover to the tailgate in an extended state which protects concealed items from theft and weather. The roll top tonneau is uniquely formed by a plurality of successive and interconnected slats via a reinforced rubber connecter assembly. Each of the plurality of slats is attached to a first and second, respective adjoining edge by a successive or adjacent slat. The adjoining edges are formed of a first and second tapered channel for fictionally securing the reinforced rubber connector assembly therebetween.