I try to do my longer rides, and mini-tours in the sunshine, so I'd prefer reasonably lightweight panniers with a few pockets. And, waterproof would be nice, but not vital. I do like heavy duty zippers if I can find them. Wet stuff can be tied to the outside of the bags.
I have been considering waterproof panniers for commuting which does get winter rain, but so far they haven't met my needs, and are expensive.
My latest pannier set includes a pizza box sized integrated trunk bag. I bought them second hand, so perhaps a custom build. Anyway, great for those trips requiring picking up pizza boxes. I'm not sure if I'd use them for touring, as I still have been tying stuff onto the rack.
I have also been eying some of those backpack convertible pannier sets, although they are a little expensive, and I'm not sure they'll fit my needs of a backpack or pannier set well.
https://www.pannierbackpacks.com/pro...nier-backpack/
There may be other brands too.