GREAT bag!
I put this on my luggage carrier on a road trip from southern Indiana to western Colorado and back - through searing heat in Missouri, windstorms in central Kansas and outright downpours in western Kansas.  When I came home my bag looked like NEW and my contents were totally dry throughout the whole trip.  I had 6 suitcases in there and a couple of soft bags tucked in as well so it was full, and DRY.
Rating: 5 stars