I've bought a bit of gear from Thirdgear before, and for the price, I've found them pretty good, but I've got no experience of their tank bags here:-http://thirdgear.com.au/triplex-motorcycle-magnetic-tank-bag/Can't argue with the price and the features seem in part to be what you're looking for.
I've just bought one of these to go with the Bagster tank bag I got from Streak a while ago, haven't tried it yet though, will let you know when I do. My baby is at the mechanic's a the moment getting a carby rebuild.http://www.ebay.com.au/itm/BAGSTER-EASY-TRAIL-UNIVERSAL-TANK-BAG-HARNESS-/261429721655
test the polarity of the magnets to make sure they are attracting the ones in the bag BEFORE you glue them on
Thanks Shiney. I missed the opp as it is sold.Regards Garry
That looks as if the rear of harness would be secured right over the flap to the 1100 fuel tank.That could be a problem. the bagter harness has a zip flap at the rear.