FYI, the B&W Clapton case that we just received weighs 15 pounds 3 ounces (6.90 Kilograms) with the included foam padding when weighed on our Park Tool DS1 digital scale. The tag on the case says that is is a "new 2011" model. We have test-packed a 2012 Brompton P6R (with Shimano dynamo lighting and telescoping seatpost) in it. It's tight. But it fits.
Norman, Oklahoma USA