I have a bag bellows for my Cambo, and I use it all the time, including with the 210. As Ian says, the only time I need the long one is for closer up shots. The real reason for having it, IMHO, is to increase the movement range in the camera standards with short lenses. The reason I got it was that the original leather stock bellows would not allow extreme movements with the 90 lens.
Also, with the bag bellows, you have to be careful that it doesn't sag into the image path when shooting, which the leather one generally won't do.