I bought this last minute for a weekend trip my wife and I were taking. We needed something that most of our stuff could go in and stay out of the hard bags on my 2011 Harley Ultra Classic. Mainly because the rest of the bags were taken up with rain suits, hoodies, and other helmets. When I received this item I was instantly amazed at how well it was constructed. Strapping it to the bike was super easy with the supplied straps. And the provided rain cover 100% works. We rode home on our last day for over and hour in a half in pouring rain and once we stopped I checked our bag and everything in it was dry. I cannot say enough about this bag. Not sure about other bikes but even extending the sides out further it sits perfectly on the tour pack rack of a Harley Davidson Ultra. Don’t hesitate on purchasing this. It is just as nice as the Harley pack and it’s way cheaper. Plus it has shoulder straps to wear it like a backpack.