I went for a SW Motech in the end so thank to everybody for the advice and lets see how it fares next week as I'm off to france, Italy, Austria, Germany and Belgium. Cheers guys.
I managed to pick up one of these from ebay Oxford Mini Sprint Tankbag. | Any bike & fitted some of these also from ebay 4 x 40mm thumb screw suction cups/pads (suckers) rubber/plastic turn nut | eBay so I could secure to the Multi tank as below. Handy cheap little tank bag.
givi T491 got it there because of some heavy camarea stuff to put in... also carries a detachable money/papers-belt ring mount installed in 5 min by this unhandy clutz... grtz Koen