Like the first reviewer, I thought the box was too small for the Nikon SB800 flash. Actually it is the perfect size if you mount the flash on a stand and stick it through the back zipper UNDER the softbox umbrella shaft.Trying to mount it on the umbrella shaft like the instructions say does not work.
It is a quality product but I purchased it to use with my off camera Nikon SB-800 mounted on an adjustable mount. Unfortunately the size of the flash and the length of the mount make it too long for this umbrella style mount. I plan to keep it because it will fit on a standard flash head for hair light or a very specific lighting application.