I finally received the Elite Seat Sak that I ordered from luggage locker. Great bag. I'll try and post some pics soon.
The bag attaches to the seat with velcro straps. The seat then locks to the bike. Very neat set up. I've had one on a Brutale for several years and another on an Aprilia Tuono for about four years. They work GREAT! Just make SURE your seat is locked all the way! If you really stuff one, its good for a four or five day trip, but best just for carrying stuff around. Holds a Laptop PC nicely. Les runs a very small shop so occasionally things may take a little while, but he's a great guy and the product is as good as it gets.how is the bag actually attached to the bike? i dont see any straps.
so somehow this seems to be a sweet solution.