Yes I have.
The older FS-BAG (466357) can carry 3 rails (2x1400 & 800) and it has a Velcro pocket on the front.
And the FS-BAG-PA (496940) can carry more rails and a lot more FS accessories, but it's huge.
Both are not available any more but the first one can sometimes be found at ebay.
The latest FS-BAg can only carry 2 rails (1400) and has a pocket with a zipper meant for the rails connectors.
I have the same bag as Neeleman, but I never use it, I think that the bag is quite heavy with 2 1400 with connectors and 1 800 rail.
and I hardly ever couple rails anyway, I just carry my 3000, 1400 and 800 rail without bag.