Inside the bag and thru double slots on the side facing the bike, there are 3 straps. In the center slot there is a leather strap with buckel. Then there are 2 nylon straps with velcro on either side of that. The excess material from the straps take up valuable storage space in the bag and the velcro straps are a general pain in the **** and don't work that well. I replaced them with plastic electrical cable zip ties. They are easier to place, more secure and the excess can be cut off. They are easy to cut to remove the bag and easy to replace.
Great write-up. Question though. will this bag work with passenger footpegs?
Check out Bikers Friend page. They show their bags on all types of bikes and they have a great product. Check out the roll bag that substitutes as a backrest. http://www.bikersfriend.com/