This is an idea for anyone who travels light and doesn't need the capacity of the standard boxes or to be half the width of a car!
Have made this system for my former Tigers' as I usually travel without pillion, and found I can fit everything I need.
First some support frames made from 8mm round steel bar, some 1"x1/8" flat steel and some 10mm ID steel tube. With the aid of an angle grinder and a mig they turned out like this.
The brace picks up on the std pannier side sway mount which was removed.
(http://i1212.photobucket.com/albums/cc455/metalguru1/DSCN1552.jpg) (http://s1212.photobucket.com/user/metalguru1/media/DSCN1552.jpg.html)
(http://i1212.photobucket.com/albums/cc455/metalguru1/DSCN1553.jpg) (http://s1212.photobucket.com/user/metalguru1/media/DSCN1553.jpg.html)
Then it was a simple attachment via some P clips with a flat aluminium bar inside the bag for strength and form.
(http://i1212.photobucket.com/albums/cc455/metalguru1/DSCN1555.jpg) (http://s1212.photobucket.com/user/metalguru1/media/DSCN1555.jpg.html)
This mounting is slightly different as it has some sheet aluminium between the bag and frame to shield bag from exhaust.
(http://i1212.photobucket.com/albums/cc455/metalguru1/DSCN1554.jpg) (http://s1212.photobucket.com/user/metalguru1/media/DSCN1554.jpg.html)
The bags cost 99p from fleabay and are expandable to twice the width if required, they fair very well in heavy offs, (don't ask). They do tend to sag with a bit of weight in them but a luggage elastic up to the grabrail sorts.
The Steel stock came from the local fab shop scrap bin!!
Nice and easy! :thumbsup