Hi Andy, Its a different bag than the 300mm vr softcase, its the same bag that comes with the 200-400mm VR. I would defernately try it though before you buy one. Its going to be a while before I get the 300mm so its not a problem you buying from me if not this is where I purchased the bag.
http://www.amazon.co.uk/s/ref=nb_ss_...&Go.y=13&Go=Go
Cheers