I carry my Gowland 8x10" monorail, up to 5 holders, up to 6 lenses, darkcloth, meter, and all the odds and ends in an ordinary padded knapsack designed for laptop computers. The camera, rail, darkcloth, and a small lens go in the main compartment. There is a thinner compartment for the holders, a smaller one that can hold meter, two smaller lenses, filters, and doodads, a yet smaller compartment for a large lens and two barrel lenses that fit onto the shutter of the large lens as well as my notebook, and a small zippered pocket up front for things I tend to need frequently, like cable releases and a level.