You have too many wrenches. Chances are you don't need a whole set of flare nut wrenches, probably one will do. Take them around your care and try every flare nut you can find and store the rest at home.
There are so many wrenches there, I figure you either have many duplicates, or very complete sets of both SAE and Metric. If you have an late 80's/early 90's Metric/SAE car you might need both, but not all of both. I carry only Metric tools now. I can't even think of a friend who has an SAE daily driver any more.
You have too many punches. Chances are your vehicle does not use all those Torx and socketed bits.
You need to add at least one pair of locking pliers (vice grips), and a little VOM or at least a continuity tester.
Think about your needs. Are you rescuing yourself? Or your wife? Or just about anybody? Each level requires more tools than the last. I stick with myself. My wife's car has its own tool bag with tools appropriate for that vehicle. If I get a call from a friend, chances are I'll have a chance to swing by home and pick up more tools.
Everything I have has to fit in a 12" tool sack. I value completeness and compactness over organization. If I have a breakdown, by definition I'm going to be late and will take my time to sort through tools. I am better organized than "everything dumped in the bottom", though.
Rollups work well. I use a huge and a medium size Carabiner (D clip) from HF to hold Combination and box end wrenches. For sockets I just put them on a long wire and tie the ends together. The wire also serves as a repair supply item. The wire is a good solution for minimal space but not for someone who uses the vehicle toolbox often.
To answer the title question, I carry: 1/4 shallow Metric socket/ratchet set, 3/8 shallow and deep metric socket/ratchet set, Spark plug socket for that car only, 1/4&3/8 U-Joints, 3 extension lengths for each. 1/2" breaker bar and 3 socket adapters 1/2 down to 1/4"...
8-19mm combination wrench set, ignition wrench set, one flare nut wrench...
one hammer, one punch, one chisel...
alligator nose, slip joint and water pump pliers, diagonal cutters, 2 sizes locking pliers, 1 adjustable wrench, electrical crimp pliers, Metric Hex and Torx folding key sets...
spark plug gapper, cheap VOM, screwdriver set (some cars complete handle set, some a bit set with driver handle), mini "close quarter" hacksaw (just a handle/holder thingie), spare hacksaw blade...
vehicle specific tools, other stuff I forgot.
In a pinch, if the Hex or Torx key doesn't fit because the handle is in the way, just dis-assemble the handle.
Hammer, chisel, and hacksaw come in REALLY handy for removing unhinged bumper covers and/or rolling back fenders from tires after minor accidents, letting you get back on the road instead of call a rollback.
but between my trucks/cars, friends trucks/cars, the boats, jetskis, quads, trailers, bobcats, tractors, regular smaller equiptment I have needed and used all of it.
