I have a few requirements for a tank bag.
1. It must prominently display my trusty maps (I'm a technophile but I still prefer maps to GPS even though my last two bikes had GPS)
2. Not too big. That's what my hard bags are for.
3. Can't touch the tank. It's a thing with me.
On my BMW's it was easy. The Marsee corona tank bag system. Unfortunately they don't serve Japanese bikes. So that led me to the Bags-Connection "Engage" Quick-Lock Tankbag for the SW-MOTECH Gascap Mounting System. I know, it's a mouthful. And expensive. I ordered it from twistedthrottle and mounted it today.
Here it is...
As you can see it doesn't touch the tank.
I ordered the optional map holder which clips securely over the top of the bag and holds a large map. Very nice.
Has a display window pocket for your phone. Not that useful for my iphone. You can see that the map holder flips up to allow access to the bag underneath.
Here's the SW-MOTECH gascap mounting system.
And the matching connection on the bottom of the bag. You have to drill and mount this yourself which is a PITA but it does allow you to custom fit it to your tank.
View from the saddle. Very nice.
View inside the bag. Room for DSLR camera, cell phone, keys, water, snacks, extra gloves, a few other odds and ends. not the kitchen sink.
Total cost delivered with the map holder was over $200. Overpriced Eurofarkle absolutely, complete with bizarre euro-instructions. But the only one that fit my requirements, and I sold my old Marsee bag from my ex-BMW for almost that much so it was a wash for me. I do not like the attachment/detachment mechanism nearly as much as the Marsee system which is much superior in every way. It is decent quality however and for those that like the gas cap mounted tank bags, which really is superior to magnets or straps, it's your only option for the Suzuki that I know of. If you want to really go nuts you can get them powered for your GPS and phone etc. There is also an integrated GPS mount for the engage bag which looks nice. I passed on those options as this is a back-to-basics bike for me after having two GT's with cockpits resembling the flight deck of a 777.