With the R1 (and a metal tank) I sometimes use a nice tank bag for long rides (150-200 miles).
But with the 1098, no tank bag.
Since we do a lot of long rides in SoCal, in the mountains and desert areas, I just added this to my limited storage:
I put 30 inches of 1/4 inch clear vinyl tubing in a 1 qt (quarter of a litre guys) clear plastic bag. Expectation is that one day, on a long ride, either Wifey 848 CDUC or I will run low on fuel, and with the tubing and baggie, could do a quick, one time only fuel siphon from another Ducati Riders bike. So, tubing in the baggie in the tail is my low fuel insurance.....