I use a largish photo backpack, it has zippers that allow it to open horizontal rather than vertical like a standard backpack so the body, backs and lens are in one layer. What I had to do was buy fire foam to cut inserts. I only carry one body but 2 backs, and 3 lens, a wide, the standard 100 and the 150, a set of filters and a light meter. As I have grown older I now usually carry a 2 1/4 by 3 1/4 Speed Graphic with 6 film holders and 2 lens, a 55 and 105, much lighter.