I jeep and found the best the best road kit is a vehicle-specific kit. If you've had your jeep a while, and wrench on it, you know most of the sizes. I've gotten small canvas zip pouches for each of the sockets, extensions, ratchets, and wrenches, so their easy to find but pack tight. Add in the screwdrivers, small hammer, a small vise-grips (I like small and medium cowboys too), a quality pair of channel-locks, a mexican micrometer, and anything else that you use. Add a small WD40, LPS, oil bottle, little grease container, tape, zip-ties... whatever your choices. Add in the few rags and a few pair of rubber gloves. Put in everything you know you use and leave out all the "set" stuff that really doesn't get used on your jeep.
Get all that out in front of you, and then find the smallest pelican case (or a good knock-off) that will hold it all and pack it all in there using the rags for padding. It's the best traveling case I've found, supports the weight, and is waterproof. We used a similar setup on our boat out in the ocean.
It works for me because it gets everything I might need, knocks it down to the tightest space (critical for jeep travel) and the pelican is waterproof and has a solid handle for the weight, tough enough to stand on, but the plastic makes it pack and travel well.