How about listing the things that you want to be able to do at the field using a field box. Like ...

Be able to setup and operate a nitro (or gas or electric) plane. The field box would the simpliest.

However,

Be able to setup, trim, tune (alternate props for every plane that I own), repair my (and other's) planes at the field. The field box needs to be huge.

Understanding your needs can help to identify the type of field box(es) that you take to the field.

I use a small box with a battery / power panel and basic setup tools for the 90 percent stuff (glow power). I leave the "everything but the kitchen sink" boxes in the vehicle. Many times, the "everything" boxes never make it to the vehicle.

So, what do you need the box to "do" for you?