Portable Tool Kit - what works best?

Best I ever did was carry 2 slightly big tool bags.

One for sockets with socket organizers, ratchets and pliers.

The other for wrenches with wrench organizers, screw drivers.

I just threw little odds and ends in either bags as well.

But this setup was for side work.

When I was wrenching for a oilfield company I had a truck with a utility bed.