how big (in Liters)are these and how do...
how big (in Liters)are these and how do they attach to the bike?
They sit over your rear rack and then clip to the sides of it with anodized clips. When you lift the panniers off the bike, magnets snap them together so they just look like an over the shoulder bag. I am not sure what they are in Liters but they are about 500 cubic inches each.