Good luck keeping everything organized if you are carrying this in the truck. If this is a stationary toolbox... these are GREAT socket organizers:
Socket Organizer That is the 1/2" drive model. They offer SAE and Metric (red and black, respectively, to help quickly find what you need.) They also have 3/8" and 1/4" drive.
I don't have this particular model, but this sort of system works very well. Again, I am not sure how it would hold up in a traveling box.
For wrenches...
Hmmm just noticed your offroad requirment...
I have two kits similar to this one in each vehicle:
Craftsman Tool Kit These keep sockets well organized and the lid has plenty of storage for wrenches.
You may have more luck with a kit like that. For my wrench boxes, I have something similar to this:
Wrench Box I carry the socket set, with miscellaneous wrenches, and both a SAE wrench box and a metric wrench set. Those wrench kits are not exactly what I have, but my boxes always have held all the wrenches right where they belong.
I would think that the box you purchased is more well suited to sitting on the self in the garage.
Don't forget you can never have too many tools. Never know when you will need two wrenches the same size.
Hope this helps.
-Jeremy