Magnetic tank bags are great - if you have a steel tank and no plastic panels attached to it, which will interfere with most magnetic tank bags. Unfortunately for this reason most magnetic tank bags do not work well on the Versys. I had to sell my Cortech tank bag as it would not stay attached to the Versys due to the plastic panels on the sides of the tank interfering.
The SW Motech "City" tank bag is often recommended. I have a generic $15 Cycle Gear tank strap mounted bag. It performs as well and looks as good as a $30 tank bag - which is to say it sorta works and does not fall off the bike frequently, and is not a bad value at $15 because of this, but don't expect to be anything like a $200 SW-Motech tank bag.
Last edited by twowheels; 01-20-2016 at 10:27 PM.