The 14oz store in Mitte has the green duffle. Not sure about the size, but I spent a few minutes just savouring the feel of the fabric when I visited there at Xmas. Incredibly nice. Worth 2k? A duffle worth a decent secondhand car? Hardly. They also had quite a lot of other Cabourn stuff, including an absolutely superb Harris Tweed Cape Cameraman.
The 14oz on Kudamm has the holy grail of trousers in stock though, at only 299 euros a pop. The Bombay Pants in 4 different varieties of Harris Tweed. As rare as hens teeth?
More about my trip to Berlin here: http://welldresseddad.com/2014/01/03/so-i-flew-to-berlin-for-a-weekend/