| I'd suggest Evertons Baglux as they protect the tank from getting scratched.
You've got to be very carefull with magnetic bags when you take them on and off as the slighest piece of grit will scratch the tank. By nature of the way the magnets hold them on people tend to drag them off a little when removing them and bingo, nice scratch in yer paintwork. I've seen it a few times. | 
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