I originally had this on one of my other bikes, but took it off and put it on the DR650. It fits perfectly on the Suzuki luggage rack. Its an American Tourister shaving bag I bought at Walmart for about $12.00 as I recall. (I'm sure they probably still sell them.) I fitted a plastic base inside the bag using some flat plastic stock I had. I drilled holes in the base and poked holes in the bag with an awl, and fastened the bag to the rack with zip ties. Although the bag is plastic lined, I'm guessing it was designed to keep liquids in (not spilling in your luggage) rather than to keep liquids out. So I don't know how waterproof it would be. However, a rain cover from a tank bag I have fits the tail bag pretty well. There is one main compartment and two zippered compartments on the sides. It holds a pretty good bit -- I've had a phone, camera, sunglasses, tire gauge, hat, spritz water bottle and hand towel to clean the helmet visor, and Frogg Toggs rain suit in the bag at one time. It holds its shape well when not loaded. Anyway, for what I've got invested in it, it works great. Just thought I would share.