Every vehicle we use has a version of this with a few decent quality hand tools added to it:
Justin Case Premium Travel Pro Auto Safety Kit - Walmart.com
One of these:
http://www.amazon.com/Slime-1034--T-Handle-Tire-Plug/dp/B000ET525K/ref=sr_1_1/191-6774465-4709564?ie=UTF8&qid=1422221679&sr=8-1&keywords=tire+plug+kit
That plug kit has saved my bacon several times.
Large Roll of Duct tape, Heavy Wool Blanket, wind-up flashlight and a Multi-use tool / Leatherman knock off. Usually a used serpentine belt also.