I didn't use that image because it's a terrible one. It doesn't compare to anything and it's hard to determine the true size of it. Sure, it's going to be thick, but for someone who needs the protection/extra battery, it's definitely worth a buy. This case is obviously not for everyone.
Nothing to compare to? In that case, the photo that you posted is also irrelevant because I have no idea what to compare it to. Sure there's an iPhone inside, but I have no idea how far past the edges the case extends. lol
We all know what the iphone looks like from the side, and we all know the distance of an inch. If you don't know what an inch is, but have an iphone, just multiply the iphone's width by 2.75 TIMES, and you'll get the width of this monster case. Yes, almost triple the iphone's width.
Seriously, just carry one of those plug-in battery chargers with you and not turn the iphone into a brick. It's not like this case is waterproof or anything, anyway.