Interesting question that I considered last summer.

I found that with my rig as it was, I often had to put my sleeping mat between the aeros and really had to pare down what I carried.
But I also did not want the big profile of rear panniers.




So I looked at smaller front panniers to go on the rear instead. I was all set to buy Ortlieb front city rollers but couldn't for the life of me source any locally. Then I looked on the Carradice website and saw some front panniers on sale in the same waterproof style as my Carradry saddlebag so I bought them. Even with shipping $20 they were less than the city rollers. Arrived in 3 days from England!




One thing I like about them is that they have tensioning straps to suck in the belly of the bag if it is lightly packed.
Now, with a hybrid bikepacking/touring set up, I can pick and choose what I bring or leave home each trip.