I don't know if you want a boat box or a vest box. I keep all my large bass flies in the Plano 3700 series boxes. The dividers can be customized to the configuration you want. When on the water I use the smaller Plano boxes that have six compartments. They will hold about a dozen or so large flies and still go in a vest. I just load them up from the big boxes before I leave the car. I have a couple of the C&F 3500 boxes I find great for large flies. Just my 2 cents. John