Also, you can have 12v power in SW Motech, I have mobile phone charger in mine and have also charged up camera batteries at the same time.
No fuss, wires are integrated in tank ring and as you clip bag on, 12v is connected, very neat.
Also SW Motech bags do need final fitting by you which is four holes drilled in the bag base to get it located.
I got the GS Style and also a day bag so can change them over when going on longer trips.