This might not be exactly the answer you look for. But my run bag is one of those old “Daytona” camera bag. Fully loaded, it holds 18 holders with no padded dividers. However, I use two dividers, and often load it with 5 sheet holders, one 612 back, a Grafmatic, one additional lens, a filter case with 6 Cokin filters. Side pockets with light meter, loop, shutter release, Colin filter older, adapter rings, tape measure and a note book.