Gents:
I'm slowly getting ready for spring time. I accidentally came across a set of saddle bags that fit the S40 nearly perfectly. The are designed so you don't need any supports as well. Also, take a look at the little tank bag. Wolfman is a real good luggage to consider. I also put on an Alaskan Sheepskin cover on the seat.
http://wolfmanluggage.com/ Best regards,