I am far from the avid photographer. I have a vintage Pentax K1000 that I will occasionally take with me while camping or fishing; but when I do, I take it in my medium field bag. I usually just carry the camera, an extra lens or two, a couple rolls of film, and somewhere small odds and ends. I have plenty of extra room in the medium field bag, but I'd hate to have the small field bag and risk not having enough room for any additional equipment I might find I need.
1/1/13 at 1:03am