That's where I carry my sleeping bag. Where do you put yours? (Assuming of course that you use one.) I put my tent in one small compression sack, my rainfly in another, and then squash them each down to the size of, say, a kid's Nerf basketball. The balls go in the panniers. I've never been entirely happy with that solution, though.

To remain on topic : I have the roller classics in red, and like them very much -- simple, light, durable. I put the small front panniers on the rear rack for commuting. I don't know how much the bright color actually helps in terms of safety, since from the rear all Ortliebs (well, all the classics, anyway) are black (with reflective patches.) Agree with the poster who said bright panniers look better in photos.