As the box below has a bulge for the Porters and also is quite big, they covered by the Mounting the rear light. For this, the box is still on the back on the rack. Otherwise it is quite stable for the price. There is an additional padlock required that must not be too large otherwise leaves the box to open a gap and not too small otherwise it will be a "fumbling". My conclusion: For Alträder who the lighting on apron and suitable for people with small fingers. My box gathering dust now sadly unused, because the supplier did not want zturücknehmen ....