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.

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

Tools are useful for basic auto repair by either you or your friendly good samaritan.

Good for checking and cleaning 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.

Ice in drink - good. Ice on windshield - bad.

Runs off regular outlet or car outlet.

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

Provides traction if you are stuck in snow and ice. Your kitty will like it too.

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.