I use this for my Leica M7 and a few extra lenses. This may be a small bag, but it is perfectly well suited for this compact format in my travels. The inside is configurable, whcih makes for easy access. Lots of pouches, and well-positioned. Not for bigger SLRs/multiple SLR-sized lenses.
I use this bag for day use when I just want a camera with attached lens and an extra lens. It will hold filters and many other things. I use it for travel and even put my wallet in it for sightseeing. It is very comfortable to carry. The strap which is adjustable can be made very long or short for me.