I use them for my Canon EOS 550D with battery grip. It fits the camera with the ES-F 18-55 mm or with the EF-S 55-250 mm and the battery grip pure. When I use the 18-55mm I can even grab the Metz flash MB44 AF with pure, then it is but quite narrow. But is still ok if you want to prevent the camera is dirty or wet.
I have a backpack from Lowepro Toploader and has the same quality. This bag also has a stowable coating that protects against water and excellent sun. Against extreme sun this coating helps really good, the bag does not heat up. A test case of rain I have not done.