Abstract: A device for fastening the trunk lid or tailgate of an automobile, for example when carrying an oversize load, which prevents the trunk lid or tailgate from being shut properly, comprises a strap adjustable for length and having at one end an openable clasp, similar to those used on dog leads, to engage a striker of the trunk lid or tailgate lock and at the other end a triangular keeper element with cylindrical portions of different diameters.The triangular keeper can be rotated within a loop of the strap to bring any one of the cylindrical portions into line with the strap. The selected cylindrical portion being that appropriate to be received in and retained by the latching member of the lock.Instead of the openable clasp illustrated, that end of the strap may be fitted with a plate having a keyhole slot to engage a cantilever striker of the kind with an enlarged head at its free end.