As a mechanic by trade and long time R/C'er, there is really no such thing as a perfect list of what to have. There is one rule I have always lived by though. Every time I have to borrow something from someone, I go buy one. It's that simple, and it doesn't take long and you'll have your field box as close to perfect as you can get it. Just start by getting everything you can remember that you had to borrow.