Originally Posted by
BobG
I have a set of Axiom bags with the "Vario" system. Those hooks alone are not locking but they are adjustable for a snug fit. A middle tab is included that rotates under the rack rail to lock the bags in place. The twist hooks would work better as an add-on if you can find them at Velo-Fred or the Lone Peak clips at Bag Shop. That said, if you ordered the Vario hooks it would likely include the center locking tab...
That locking piece in the middle looks pretty neat.
A pannier I bought in Europe a couple years ago uses those same hooks, but only has a velcro strap in the middle instead of a locking piece like you have. But I do not tour with that pannier, it has not fallen off yet. But sometimes I forget to un-hook the velcro strap and I pull the pannier off the rack with slightly more effort than would be needed if the velcro was not there, the velcro really does not do a very good job. That said, a bigger piece of velcro could be made to work well.