Have any of you figured out a good way to mount a Wolfman Rollie bag (medium) on the seat without an added rack? I've got a 2010 V with Givi hard case side racks and OEM Kawi (made by Givi) cases. I recently bought a Wolfman dry bag for a late May camping trip, and would be grateful for the wisdom of anyone who has a good system for strapping it on. A tail rack, while that would be ideal, is not in the budget this year. Thanks.