This is Giant Loop's tank bag solution for tall, tower-shaped motorcycle fuel tanks, such as the large-capacity Acerbis dry-break type models. On these models, the slope of the tank makes using a typical tankbag impossible. On the Buckin' Roll, the bag wraps around the tank instead of perching on top. Keep all the essentials handy, but securely out of the way when standing on the pegs and roosting' down the trail. Buckin' Roll fits many dirt bikes, supermoto and dualsport motorcycle makes and models equipped with tower-shaped fuel fills, including Acerbis and other large-capacity dualsport and adventure touring fuel tanks. If your bike has engine guards or frame tubes under your tank, it will also strap on to a number of larger machines.
By the way, bucking roll isn't someone with a mouthful of Skoal commanding you to start riding, it's some good old fashioned Oregon innovation from the early 1900s. Look it up.