Sorry for the delayed response. It's been a chaotic week!!
I had a photographer I collaborated with a few times that had the Incase bag. It seemed to fit his 5D3 and a few lenses pretty nicely but the more I look at the design it does look compact for when I want more than two or three lenses.
I normally shoot cars or landscape so I'm lucky that I don't have a current need to carry multiple bodies or a huge array of lens options but that's partially because my collection has only a few items.
As I purchase more I can see how I would outgrow that Incase bag quickly.