ya, one of my old pair of Ortliebs from the early 90s had this happen once and warped the plastic rigid stuff a bit, meaning that it would happen again if I didnt have much stuff in the bag. Partially full it was fine, but I never used it solo anymore. I should have gotten a diff rack but never did.
there are reasonably priced racks such as this with the "dogleg" thingee as suggested, so you dont have to spend over a 100 bucks for me.
http://www.mec.ca/AST/ShopMEC/Cyclin...nnier-rack.jsp