My kit includes a spare tire, appropriate jack and tire iron, work gloves, jumpstarter, air compressor, jumper cables and a tow strap. The BOB that goes with the car has a headlamp, a handheld flashlight, and a multitool (among many other things).

My wife prefers a separate jumpstarter from the compressor due to size. I prefer a combined unit; mine has an area light on it. These units require regular maintenance; I charge them both monthly.