When I was shooting weddings and other events with film cameras, I tended to carry two M's with different lenses and usually (but not always) the same film in each. If I was still doing event work I'd prefer to have two digital bodies with a fast prime on each rather use zooms. I still have two M film bodies, but now that they are just for personal use I normally only carry one unless I'm traveling somewhere I doubt I'll go again. Sometimes I'll carry two or even three lenses with me, but most of the time I just carry one, especially if I'm just carrying a camera about my daily routine. More often lately I will put something like a little Olympus XA in my bag to have another lens option but still keep my carry kit small and light. Low weight and small size has always been a priority for me, and has only gotten more of my focus as I get older. The more important my photography is as part of what I'll be doing, the more gear I am willing to carry - but I always have an eye on size and weight.