I have a Goldberg Supertote, which is not a large box but still can be heavy when loaded. I got tired of carrying it to the flightline very quickly. I designed one I called the "Basic Necessities" field box. It has a place for fuel, 12 volt battery, starter, power panel, and transmitter plus a small drawer for essential tools and parts. One good thing about it is that the fuel can is below the handle so that balance does not change as the fuel is used. There are plans on my web page for this field box. Those who written to me about building it say they really like it because of its simplicity.