Quite frankly, I haven't been able to try one so I don't know. I should really ask my cousin to take it with him when he drops by.
I also consider getting one for when I want to take just my A350 (to be replaced with something A700-ish and a grip) and my 70-400. Currently, this combination is about
28-29 centimeters long if I remember correctly. The largest model is just
large enough to fit it...and I'm not even using a professional DSLR nor grip
I'd suggest you go and have a look in a local store where they have them...or you could just see what gear you want to fit in it and see how long it is, prior to looking at dimensions on Lowepro's website.
Just remember you'd better have some space left - if gear fits really too tight in a bag, it may affect the zippers.
SSM/NEX-5/18-55 OSS/Lowepro Pro Trekker 600 AW/CompuTrekker AW/Nova 140 AW/Street & Field gear/Toploader Pro 75 AW. And a huge wishlist...My photos on Flickr...