An inverted V-shaped bulkhead void filler for filling empty spaces in a cargo area during shipping includes a novel non-pivotable, but disengagable, interlocking structure. The bulkhead void filler includes first and second rigid panels of a sandwich-type construction attached by the interlocking structure at an upper end of each of the panels. To form the novel non-pivotable, but disengagable, interlocking structure, the second panel includes a side clip and end clips attached to its upper end. The clips define a gap substantially equal to the width or thickness of a leg of the core. The leg of the core of the first panel is slid into the gap and held securely therein.