Besides the typical use on the roadside, useful for signalling to helicopters for help.

You will have to replace the tire after using this because it makes the tire unpatchable. But if you can't or don't have time to put on a spare tire or pump up, this would be useful. Get the bigger 20oz size if you have large SUV-like tires.

If the car is on fire, use the extinguisher. If YOU are on fire, stop, drop, and roll. At least, that's what I learned in 3rd grade.

The premixed 50/50 allows easy refills or topping off of coolant.

Folds up to take up basically no space. Cheap enough to be one-time use.

Good for checking hot fluids. Like coolant, not body fluids.

If your coolant hose is leaking, try wrapping a bunch of duct tape around it.

Holds the junk in your trunk.

For cold weather situations. Find a sleeping bag that compacts into a small stuff sack to save space. A fleece blanket can be adequate depending on your climate.

Hypothermia may be hazardous to your health.

Cavemen could start fires. So should you. Get the cheap disposable ones at the local megastore.

If you don't know what snow looks like, you probably don't need these.

Probably don't need this in the car but useful in the garage if your battery is dead and you need enough juice to start your engine and drive to the repair shop.