Do not go - the camera with screen viewfinder is too great. Without viewfinder the GXR would fit almost pure. The length of the bag with M-module and a lens is not a problem. I did it with a brief appearance tasted (4.5 cm incl. Sunshade). Slightly longer would still go.
Caution: It is not supplied belt.
Nice detail: The bag has a small battery inside side / battery or memory card pocket.