How to organize a tool box

Best thing I ever did for keeping my tools organised was getting a smallish plain steel toolbox and buying a set of cheap travelling tools (spanners, sockets, hammer, pliers, vice-grips, screwdrivers, multimeter, wire crimpers, zip ties etc) for loading in the Scamp for trips/working on friend's cars/attending friend's breakdowns/going to our rural property. Before that, I was constantly grabbing stuff out of my main toolboxes and throwing them in plastic bags, losing them, leaving them places.

It's not painful at all to lose or round off a $1 generic 1/2" extension using it as a drift to belt out something on the roadside. Doing the same with the Snap-On one out of a boxed set is a little different.