Hi Peach,
I have a Crumpler Pretty Boy XXXL/7500 and it fits a 40D with 24-105 mounted, a 70-200 f/4L IS and hoods loose on top (and you could fit a 430EX or 580EX inside the loose hoods). To be honest the Muffin Top you linked looks almost exactly the same as my Pretty Boy, so maybe they just...