What Should Be in a Car Emergency Kit
A car emergency kit needs three things covered at all times: a way to signal for help, a way to stay warm or cool while you wait, and basic tools for the most common roadside problems. Ready.gov’s guidance on building an emergency kit notes that a car kit should hold different items depending on the season, since heat and cold change what actually works in a vehicle. Build the year-round core first, then layer in seasonal items so you’re not carrying gear you don’t need for the weather you’re driving in.
The Year-Round Core Kit
These items stay in the vehicle all year. None of them are seasonal, and none take up much trunk space.
Safety and Visibility
- Flashlight with extra batteries, or a hand-crank model that doesn’t rely on batteries
- Reflective warning triangles or road flares
- A brightly colored cloth or flag to signal from the vehicle
- Reflective safety vest if you’ll be working outside the car near traffic
Tools for Roadside Fixes
- Jumper cables or a battery jump-starter pack
- Basic tool kit: pliers, adjustable wrench, flathead and Phillips screwdrivers
- Tire pressure gauge and a properly inflated spare, jack, and lug wrench
- Duct tape and a few feet of rope or tow strap
Food, Water, and Warmth
- At least one gallon of water, stored in a container that can handle temperature swings
- Non-perishable, high-calorie food that doesn’t need cooking
- A wool or fleece blanket for each regular passenger
- A poncho or rain jacket
First Aid and Communication
- A first aid kit with a printed instruction card
- Any regular prescription medications, rotated so they don’t expire in the car
- A phone charger that works from the car’s power outlet
- A paper map of your area, since cell service can drop in bad weather or remote stretches
For a deeper look at building a portable kit for evacuation scenarios instead of a stranded-in-place scenario, Blueprint Prepared’s bug out bag guides cover vehicle-based builds designed to be grabbed and carried if you have to leave the car behind.
What to Add for Winter
Cold weather turns a minor breakdown into a serious wait. Add these on top of the year-round core once temperatures start dropping.
- Ice scraper and snow brush
- Small folding shovel
- Sand, cat litter, or a commercial traction aid for icy pavement under the tires
- Hand and body warmer packets
- Extra hat, gloves, and dry socks for every regular passenger
- A full tank of gas kept above the halfway mark, which reduces the chance of fuel line freeze and keeps you running the heater longer if stranded
If you run the engine to stay warm while stopped, keep the exhaust pipe clear of snow and crack a window slightly. A blocked exhaust can let exhaust fumes build up inside the cabin.
What to Add for Summer
Heat creates its own risks, mostly around hydration and equipment that can’t handle high temperatures.
- Extra water beyond the year-round minimum, since heat increases how much you need
- Sunshade for the windshield to keep cabin temperature down while parked
- Extra coolant or a sealed bottle of water for the radiator
- Sunscreen and a hat if you’ll be outside the vehicle
- A cooler bag for medications or food items that shouldn’t sit in high heat
Never leave batteries, aerosol cans, or bottled medications in a car that sits in direct sun for hours. High trunk and dashboard temperatures can degrade or damage them faster than the listed shelf life accounts for.
Check Your Tires Before You Pack the Kit
A well-stocked kit doesn’t help much if the reason you’re stranded was avoidable. According to NHTSA, tire pressure should be checked at least once a month, including the spare, and read when tires are cold — meaning the car hasn’t been driven for at least three hours. NHTSA also recommends the penny test: place a penny upside down in the tread, and if you can see the top of Lincoln’s head, the tread is worn down to 2/32 of an inch and the tire needs to be replaced. A dashboard tire pressure warning light only activates once a tire is significantly underinflated, so it isn’t a substitute for the monthly manual check.
Building the Kit Without Overloading the Trunk
Every item in this list has a cost in either weight or space. If your trunk is small or you’re already carrying other gear, prioritize in this order:
- Water, first aid kit, and any prescription medications — these cover the most urgent needs
- Jumper cables, flashlight, and tire pressure gauge — these solve the most common roadside problems
- Blanket, food, and phone charger — these get you through a longer wait
- Seasonal additions — add only the items relevant to the current season, and swap them out rather than stacking both winter and summer gear year-round
A soft-sided duffel or a stackable plastic bin keeps everything in one place and makes it easy to see what’s missing after you use something. For household-side planning — deciding when to shelter in place versus evacuate, or building a family communication plan that covers who has which kit — Blueprint Prepared’s home preparedness coverage walks through that decision separately from the vehicle kit itself.
A Simple Maintenance Schedule
- Monthly: check tire pressure and tread, confirm the flashlight and any battery-powered items still work
- Every 3 months: check food and water for damage or leaks, confirm medications haven’t expired
- At each seasonal change: swap winter items for summer items or the reverse
- Before any long trip: check the spare tire specifically, since it’s the item most often forgotten between checks
Frequently Asked Questions
Do I need a separate kit for every vehicle in the household?
Yes. Items left in a car go through more extreme temperature swings than anything stored indoors, and a kit that lives in one car doesn’t help if a different car is the one that breaks down. Keep at least a basic kit in each vehicle that’s driven regularly.
Where in the car should the kit be stored?
The trunk works for tools, water, and food. Keep the flashlight, phone charger, and any first aid items you might need quickly in the cabin — the glove box or a seatback pocket — so you’re not digging through the trunk in the dark or in bad weather.
Can I just buy a pre-made car emergency kit instead of building one?
Pre-made kits can cover the basics, but check what’s actually included against the year-round list above. Many pre-built kits are light on food, water, and seasonal items, and you’ll likely need to add to them.
What if I don’t have space for a full kit?
Use the priority order in the section above. A gallon of water, a first aid kit, jumper cables, and a flashlight cover most roadside emergencies even if that’s all you can fit.
Educational Disclaimer
This article is for general preparedness education and is not a substitute for professional medical, legal, or automotive advice. For guidance on medications, existing health conditions, or first aid beyond basic supplies, talk with a qualified clinician. See Blueprint Prepared’s Medical Disclaimer for more detail.