Join Date: Jun 2016
Location: Hamilton, Ontario, Canada
I've had the same magnetic tank bag for 20+ years. "roadmaster" or something like that brand. It's of a medium size, with wings containing the large magnets. I've used it on:
Yamaha Fazer 8
It's never blown off any of them, even though it only touched half the actual metal tank on my Fazer 8.
These days, though, many bikes have plastic tanks or tank covers, so that won't work. My new bike (BMW R1200RT) has a rack of sorts on the tank that apparently BMW, at least, made special bags to hook onto, with quick release. Hard to find now, though, for an 11 year old bike.