I use the Ortlieb Rollers on my 2015 AWOL with a Tubus Tara front rack. The bike handles a low-slung front load well. I've never tried them on the back rack (took it off).

The Rollers are simple and waterproof with good volume. I also like them for around-town errands because I can leave them unrolled and stuff even more volume into them as compared to when they are rolled.