I love my Ortliebs, but I had some misfortune with my Ultimate 6 (6.5L) handlebar bag.
My bike fell over on an abandoned lot type of terrain and this was the result :



It wasn't carrying anything close to the rated maximum of 5kg, maybe half that.
The frame is all plastic and mostly hollow at that.
I repaired the bag with a lot of epoxy (to fill the hollowness), 1mm aluminum sheet and a lot of screws. Now stronger, but heavier.





It's a nice bag and is always on my bike, just don't let your bike fall over...