It's interesting to note that the much bigger BMW K1600 has side cases that are almost the same size and shape as the FJR. In fact the FJR bag liners perfectly fit in the BMW side cases. Small as the side cases are, I know 2 people that just spent 2 weeks traveling over 2.5k miles carrying clothes and riding gear to accommodate 30º to 100º as well as rain. We did cheat and put a small Givi top case on the BMW. My pillion did leave her hair dryer at home and I didn't bring my tool box
Well I hate to say your off on this Alan, but the K16's have substantially bigger S/B's. And, to the fact that I can put my Schuberth C3-Pro XL helmet easily in one side and still smoosh in a jacket liner, gloves etc.
I could never stow my C3-Pro (by itself!) in one of my FJR's side bags. Not even close!. Yamaha vs BMW (OEM) top case included on this statement.
Well, I hate to say this, but my experience with the K16 says that perhaps the bag shape may be slightly different but the capacity is basically the same. We used the same FJR bag liners on the K16 as we do on the FJR. The K16 bags could not be made to hold hardly any more than the FJR bags with or without the FJR bag liners. By the numbers the BMW bags are 1 liter larger but that didn't translate into any significantly larger load capacity. The K16 was topped by a Givi so there is no comparison to a Yamaha trunk. The Yamaha trunk is designed to offer the least possible usable space for the size of the unit.
At some point I'm also going to hold you responsible for the K16's ****** 1st gear throttle behavior when pulling away from a stop. I tried all modes and found Dynamic to be the least repugnant. There may actually be something wrong with the 55k mile K16 that caused the really bad throttle behavior.