I got stuck in a snowstorm on I-80 in Nebraska three years ago. No phone service. No blanket. Half a bottle of water that was frozen solid. I sat there for four hours waiting for a plow. It was 12 degrees outside.

I was not in danger — I had gas, and the engine ran fine — but if that had been a rural road instead of an interstate, those four hours could have been a lot worse. Now I keep a kit in my trunk year-round.

What Actually Matters in a Car Emergency Kit

Forget the pre-made kits you see on Amazon for $40. They are full of useless plastic tools and Band-Aids. Here is what you actually need:

• Wool blanket (not fleece). Wool insulates even when wet. Fleece does not. A moving blanket from the hardware store works fine — $8.
• Hand warmers. The little packets that activate when you open them. A box of 40 costs $15.
• A metal cup or small pot. For melting snow into water if you are stuck for a long time. You need hydration even in the cold.
• High-calorie food. Trail mix, granola bars, peanut butter packets. Things that will not freeze solid.
• Jumper cables (good ones). The flimsy $10 cables are useless. Get 4-gauge, at least 12 feet long. Worth the extra $20.
• A bag of kitty litter. Pour it under your tires for traction on ice. Non-clumping works best.
• Flashlight with extra batteries. Cold kills batteries fast. Store them separately from the flashlight.
• First aid basics. Bandages, antiseptic wipes, any medications you take daily.

One Thing People Forget

Keep your phone charger cable in the car, not in the house. If you slide off the road with 8% battery, having a charging cable in your kitchen drawer does not help. Get a cheap second cable and leave it in the glove box permanently.

I have used this kit twice since building it — once for my own car and once to help a stranger in a parking lot whose battery died at 10 degrees. Being prepared is not paranoia. It is just being a functional adult.