Have the bag after a long search found a few weeks ago and bought for my Birdy folding bike. Firstly, it fits in perfectly to the black super bike, but this is just a nice side effect. But more important is the size. There is nothing to complain about - the bag fits perfectly to the folding bike and "does not carry too far on". This means that the influence on the steering behavior is very limited - especially when fully loaded gets the wheel even if it is turned off with the stand not overweight. The size is quite adequate for the small tour - you may just do not expect miracles.
