I was looking at an ortlieb Bike-Packer Plus Pannier, and neither the people working at the LBS nor I could figure out the QL2 mounting system. Mounting the beast to the top of the rack was easy enough, but what do you with the goofy plastic clip/tounge/lever thing that replaces the bunjie cord and hook that I have seen on ever other pannier I have ever set eyes on? The pannier seems like it would shift all over the place and be knocked around the first coblestone road I hit. What gives?

http://www.ortlieb.com/_prod.php?lan...bikepackerplus

P.S. Has anyone used the backpack attachment with this pannier?