reiny

No real suggestion as I use all these. Have just acquired over the years. 
Got this from a friend who had been riding a Harley. Worked okay, Harley luggage, but I didn't like the top lid, if you road off with it unzipped, stuff would disappear.  I lost a pair of Alpine star gloves.
 

 
This was another tail bag that he gave me.  It works good, and is a Dowco Iron Rider.  Same problem with the top lid.  I lost a new S5 Samsung phone.
 

 
This Tour Master Unit, the biggest of all (24L-26L) I had originally picked up for the FZ-09.  When I made the tail rack, I sized the rack for this case and the one above.
 
 
 
The Tour Master worked great on the FZ09 placed on the seat, what you are looking to do for the FJ09.  Here is pic on the FZ.
 

 
 
 

No real suggestion as I use all these. Have just acquired over the years. 
Got this from a friend who had been riding a Harley. Worked okay, Harley luggage, but I didn't like the top lid, if you road off with it unzipped, stuff would disappear.  I lost a pair of Alpine star gloves.
 

 
This was another tail bag that he gave me.  It works good, and is a Dowco Iron Rider.  Same problem with the top lid.  I lost a new S5 Samsung phone.
 

 
This Tour Master Unit, the biggest of all (24L-26L) I had originally picked up for the FZ-09.  When I made the tail rack, I sized the rack for this case and the one above.
 
 
 
The Tour Master worked great on the FZ09 placed on the seat, what you are looking to do for the FJ09.  Here is pic on the FZ.