call100: You imply that the padlocks simply fall off due to the stresses of being shunted around as "they are not up to the job"....
Yet the post immediately before quotes:.......
Then as now, theft was rife. His advice was that the only way to make it even moderately difficult for the bad guys was a broad strap, KNOTTED. The reason was that the guys only have a few seconds to get in and out and resecure the bag. No time to undo and retie knots, and cutting the strap is too immediately obvious to the receiving pax, which points the finger at that particular handling crew. Padlocks could be twisted off, and the chaps knew how to drop the integral lock types in the right way so as to spring the locks, so the strapped cases tended to go in the too hard file. The straps have worked for me ever since.
Quite a different explanation and one that you do not even contemplate.
it simply defies belief that so many padlocks "fall off" without any human interference. I think we should agree to disagree as I know which I chose to believe.........