I've been looking for an inconspicuous bag for my Ricoh GXR Lens with additional module or a complete second GXR body. On a city tour she has done very good service to me. Apart from the actual padded space for the camera and lens inside there is still plenty of room for the things that you as a tourist so entrains. This is even more enlarged. Also, another compact camera or other photographic equipment can accommodate there, of course. In the (unsecured) outside pockets come naturally any valuables, but map, glasses, a little victuals, drink etc.
To date, for such a purpose my best case, all the others were either too large or too small.