A slidable storage system adapted for use in a pickup truck bed includes a substantially planar, slidable base. The base has a cab-side edge, at least first and second opposing substantially parallel side edges and a rear-access edge opposite and substantially in parallel to the cab-side edge. A base cab wall, at least first and second substantially opposing base sidewalls and a base rear access wall extend substantially perpendicularly up from the cab-side edge, the first and second opposing substantially parallel side edges and the rear-access edge, respectively, for a fixed height (H) forming a storage volume. Positioning the slidable storage system on the pickup truck bed, with the rear tailgate wall in an “up” position, the base will not slide past the rear tailgate wall and with the rear tailgate wall in a “down” position, the base slides out past the rear tailgate wall, enabling ready access.