A number of people here have commented on the disappearance of the Serratus brand, formerly carried by MEC and makers of solid panniers (and my waterproof overbooties). I am pleased to report that the MEC site once again has "Serratus" panniers. I say "Serratus" because while they have been re-branded MEC, they are the same panniers Serratus use to make. They even include the famous "Aqua-Not" among them.
I already comented on this, but I hadn't seen them yet, I'm glad they pass muster.
Seratus are very simple in design, but just seem to work well. I'm not sure why they punched the daisy chain onto the lid, doesn't bode well for rainproofness, and there is plenty of rack to tie stuff to in that area.