The Ortlieb are the bee's knee's for cycle-touring, like you say, 100% waterproof and very robust. The only downside of the Ortlieb's is no exterior pockets, to store first aid kit, tools, inner tubes etc. But you can buy the Ortlieb pockets, in which you use a template pattern, then punch a hole in the pannier bag and screw on the rail. The pockets don't come cheap, then the panniers don't come cheap either.
I have the Ortlieb front and rear Roller Classic and rear Bike-Packer Classic. The rear Roller Classic I use for shopping, which I can get 4 shopping bags in, 2 in each pannier bag and ofcause the Bike Packer is used for touring and I believe Ortlieb have improved on that design, I have the older version.
Here is my bike with the Ortlieb bags minus bar-bag. This was taken up on Sleightholme Moor, 2 miles east of Tan Hill.
