I have latches like underdogs and they will come open without that clasp in place if you hit many bumps.
Derek
X2, have had that happen with mine too, same latches.
10-4......I bought the box and did not build it and if I ever get around to it I may change them but w/ the snaps there and the way it fits in my truck I have not had a problem. However I don't like them for another reason, a eager to load dog will hag its collar/vest on them some times.