Nelson-Rigg is also what I use because of "magnet-phobia". Once had a purse with magnets that ruined ALL my credit and ATM cards. Only takes once for that to happen.I use a Nelson Rigg, but, it is non-magnetic. I sometimes stick my wallet in the tank bag and would not want to worry about my credit cards.
I'd look for a bag that has magnets in the bottom of the bag rather than 'wings" like my little tank bag. The steel part of the tank area is only so wide.
Wanda P.