I've lost count of how many motorcycles I've had, 200+ at a guess, but only over maybe the last decade or so actually used a tank bag.
I bought my first one and all subsequent ones after were by manufacturers who make version generically for 'any bike, Wolfman, Giant Loop etc.
Somewhere I had made a comment that I wasn't too happy with the fit/ volume of the current Wolfman tank bag I had on my Super Tenere, and I got a message asking if i'd like to trade for a brand new Yamaha made tank bag, specifically for my Super Tenere. I figured why not, as I would be looking to buy an alternate so it would be worth a try.
Around the start of this year the box arrive and as described the tank bag was brag new, no signs of use and inside a $20 bill, and a thanks. The owner had sold his S10 and never used it but felt my Wolfman was a higher value.
The fit is perfect as expected, a clip at the front that fits perfectly on the front of the tank so no loop around the neck is required and a clip that comes from under the seat area hold it in place and magnets in the base hold it exactly where you put it.