The bag is perfect for me. I can expand or reduce capacity as needed, and even with the panniers deployed, the windage is not too bad - mostly behind my legs and body. I eliminated any rattling by adding a couple strips of cloth friction tape to the platform, which is all it takes to snug it up. Also added a small bungee that fits around the back of the track to add a little extra security so the entire bag is not held in place by a single clip in the front. Found a fitted rain cover at REI that fits over the bag without the panniers deployed. I also have a set of Ortlieb panniers front and rear, but they rarely see use for commuting . . . primarily used for touring.