This is very much a personal preference issue. I have two flight boxes, one with a power panel and another with a field charger mounted in place of the power panel. Both boxes have starters, fuel pumps, and glow drivers. I then carry an assortment of tools such as screwdrivers, wrenches, spare glow plugs, etc scattered between the two boxes. In addition, I have a small cardboard box that I also take to the field with me that has paper towels, glass cleaner, and assorted other junk. I could probably consolidate and get everything down to one field box, but hey, I got it so may as well use it.