There are plans on my web page. One is a very simple field box, basically to just carry fuel and a few tools. The other is called the Basic Necessities Field Box. It has all the space you need for the necessary equipment. I came up with this design for the simple reason that I don't like to carry a heavy field box with a lot of stuff that I only use on rare occasions. The beauty of this design is that the fuel can is below the handle so the box is always balanced, regardless of the fuel level in the can.