For almost 3 years I kept my camera in a Pelican case connected to a Best Rest Pillion Plate that replace the passenger saddle. Nothing wrong with that, save that the case was too small to carry much more than my camera. A second (or third) lens was out of the question. I had good luck with the camera in a tank-bag on my other bike. Wanting more room I decided to replace the pelican case with a soft bag. The Touratech rear seat/deck bag was the best I could find to use all available space.
Touratech rear seat/deck bag
Bag attachment
Straps excess hides under bag
The bag expands to almost twice its height. It will easily hold my camera, a lens or two, plus other stuff. It attaches with straps through the slots in the tail section of the bike for that purpose. It can be used with or without the seat mounted. Using it without the seat leaves some excess strap, but it can be routed back through the slots in the tail section to hide under the bag.
Bag open, right side
Clip on for backback use
The bag comes with adjustable straps that can clip onto attachment points to turn the bag into a back pack. The straps are narrow and don’t have any padding for the shoulders. Don’t know that I’d ever use the straps for that purpose.
Some bubble wrap for protection
Home made divider
I put a bit of bubble wrap on the bottom of the bag and then cut up the box the bag came in to make some dividers. My camera plus lens fits in one section. The other sections can be used for lenses, filters, whatever. I thought that would work OK, but see the following update.
The bag is not as weather proof as the Pelican case. The fabric is water resistant, but not water proof, nor is the zipper. That’s OK. I can always put stuff in zip-lock bags if I’m going to be traveling in inclement weather.
Update
The divider didn’t work and got tossed. I find I like to move things around in the bag according to what lens I’ve attached to the DSLR. For rain support REI has rain covers for backpacks in various sizes. I’ve one that is a perfect fit when covering the tail pack and luggage rack. It keeps the insides of the tail pack completely dry.
I used this bag on the 2013 GS that replaced this bike for a short while, too. Pictures here.