Roadside Emergency Kits: Buy a Pre-Made One or Build Your Own

A pre-made roadside emergency kit is a reasonable base for most drivers, but it is rarely a complete kit. The workable approach is to buy one that covers the basics and then add what it leaves out, or to build the whole thing yourself if you want control over every item. This guide helps you choose between the two, read any kit’s contents list, and decide which add-ons to get first.

We did not test any kits or products for this article. We compared published information instead: federal and AAA guidance on what a car kit should hold, the contents lists that makers and retailers publish, and one independent magazine test of tire inflators. So rather than rank boxes we have never opened, this guide gives you the checks to run on any kit’s listing before you buy it.

The federal starting point is short. Ready.gov, the preparedness site run by FEMA, says this about the car:

In case you are stranded, keep an emergency supply kit in your car with these automobile extras:

• Jumper cables
• Flares or reflective triangle
• Ice scraper
• Car cell phone charger
• Blanket
• Map
• Cat litter or sand (for better tire traction)

Source: Ready.gov (FEMA), Cars (ready.gov), accessed November 2026.

What the agencies and AAA say belongs in a car kit

Ready.gov’s winter weather page describes the car kit a little differently, in one sentence:

Create an emergency supply kit for your car. Include jumper cables, sand, a flashlight, warm clothes, blankets, bottled water and non-perishable snacks. Keep a full tank of gas.

Source: Ready.gov (FEMA), Prepare for Winter Weather (ready.gov), accessed November 2026.

Read together, the two pages add a flashlight, warm clothes, water and snacks to the cables, warning device, charger and blanket on the first list.

AAA’s Auto Club Group goes further. Its car kit guidance says the kit can be one large bag or several smaller ones, and it names vehicle-specific gear for breakdowns and flat tires: a tow strap, work gloves, waterproof patch tape, a reflective vest, a Class B or C fire extinguisher, a power tire inflator, a tire repair kit, a jack, a multitool, DOT-approved flares or triangles, and either jumper cables or a compact jump starter. AAA adds that a jump starter is the choice if you would rather not depend on another vehicle. It also asks drivers to learn how to use each item once the kit is packed, and to fasten the kit securely so heavy or sharp items cannot fly loose in a crash.

None of these lists is a product specification. They name jobs a kit should cover, not which bag to buy, so the useful question about any boxed kit is which of those jobs it leaves undone.

For the full packing list, including what to carry for cold-weather breakdowns, see our guide on what to pack in a car emergency kit for winter driving. This page does not repeat it.

Pre-made roadside emergency kit or build your own?

Both routes work. With a boxed kit the maker chose the contents; with a build you choose every piece and live with whatever you forget.

For most people we think the better answer is a hybrid. Start with a pre-made base so there is something in the car now, then close its gaps one at a time. Building from scratch makes more sense if you drive in harsh winters, carry infants or pets, tow a trailer, or already own half the items.

How to read a pre-made kit’s contents list

Ignore the piece count on the box. Read the contents list item by item and ask which job each item does.

Here is one worked example. It is a listing example, not a recommendation and not a test. The Lifeline AAA 4388AAA is sold as a 76-piece kit, and one retailer’s contents list includes:

• booster cables
• one emergency warning triangle
• an air compressor with a gauge
• a flashlight with batteries
• cotton gloves, a poncho and a whistle
• duct tape, two screwdrivers, pliers, a utility knife, shop cloths and a bungee cord
• a small first aid assortment

Now look at what makes up the 76. The first aid portion lists 35 bandages (15 of one size and 20 of another) and 6 antiseptic towelettes, and the kit also counts 10 cable ties. Add those up: 35 plus 6 plus 10 is 51 pieces, about two thirds of the total. The list names no blanket (the poncho aside), no water, no food and no jump starter. That is one kit as listed by one retailer, and it says nothing about kits as a category. The lesson travels better than the product: a headline piece count can mostly measure small consumables.

Other checks apply to almost any listing:

Cables. Look for a stated gauge, length and amp rating. Another retailer’s listing for that same kit describes the booster cable as “heavy duty” but gives none of the three. Our test for any listing: if it says “heavy duty” and states no gauge, length or rating, treat the phrase as marketing, and either look elsewhere or plan to replace the cables.

Warning devices. Count the triangles (the example above has one). If the kit ships flares, read the section on flares below.

Flashlight. Check what batteries it takes and whether they are included. Our guide on whether batteries expire covers storage.

First aid. A handful of bandages is not a first aid kit. Check for supplies beyond bandages, and remember that contents age, as our guide on whether first aid kits expire explains.

Inflator or sealant. Note whether the kit gives you any way to put air in a tire. More on inflators below.

The bag. Look for a bag you can strap or tie down, since AAA advises securing the kit.

For contrast, one maker’s much larger kit, as described on its own product page, includes a jump pack, LED flares, a tire inflator, a fire extinguisher and a survival blanket. That shows what a fuller kit can hold, not that it is better made.

The gaps to check in any pre-made kit

These are the places to look, drawn from the worked example and the agency and AAA lists above. Not every kit misses all of them.

The gear we list for these gaps is on the car kit section of our binder resources page.

Jump starter or cables?

Jumper cables connect your dead battery to a working one in another car, so you need a second car and a willing driver. A portable jump starter is a battery pack that can start your engine on its own. AAA lists either one. On sizing, the sources we reviewed disagree on the numbers, and none of them is neutral, so we are not printing tiers. Our suggestion: match the unit to your engine size and fuel type as the maker states them, size up for a diesel or for very cold weather, and give more weight to the sustained rating than to the big peak number on the box. Our guide to portable jump starters goes deeper.

The tire inflator

A plug-in inflator is a small compressor that runs off the car’s 12 volt outlet, and it can be slow. In an independent test, Outdoor Life timed one 12 volt plug-in inflator at 9 minutes 31 seconds to reach 25 psi on a large truck tire that had been let down until the gauge could not read it. The tester chose that worst case on purpose and noted that smaller car tires fill faster. Read it as a sign that an inflator is a slow fix, not as a claim about any product, and try yours once in the driveway so you know how it works before you need it.

Triangles, flares and LED flares

A reflective triangle is a folding stand that needs no fuel and no batteries. Because it works by reflecting light, it shows up best when headlights reach it. A road flare burns with a flame, which is why the federal rule for commercial vehicles says a flame-producing signal must be kept far enough from leaking fuel or gas to prevent a fire or explosion. The same caution makes sense for any car. An LED flare skips the flame but runs on batteries that you have to remember to check.

On expiration, the sources we found do not say flares expire. A trucking safety institute says road flares have no expiration date when stored properly, and warns against storing them above 120 degrees Fahrenheit for more than a week. An emergency planning blog, quoting a firefighter, says to replace flares that are cracked, punctured, wet or stored hot for a long time. So the habit worth keeping is to check condition and storage heat, not to look for a printed date.

On the law, here is the narrow fact we can support. The federal warning-device rules in 49 CFR 392.22 and 393.95 are written for commercial motor vehicles; 393.95 covers trucks, truck tractors and buses. They do not set requirements for private passenger cars. We did not check state laws for passenger cars, and states can differ, so check your own state’s rules.

Buying a roadside kit as a gift

If you are buying a kit for someone else, use the same method: read the contents list, apply the checks above, and match the kit to the person’s car and climate. Then add one thing the box leaves out, such as a headlamp or a real blanket. Our emergency preparedness gifts guide has more ideas, and if the gift is for someone who drives in the cold, hand warmers are a useful companion.

Keep it working

A kit in the trunk is only useful if its contents still work. We suggest opening the bag twice a year to check the flashlight batteries, the first aid supplies and the condition of any flares, and to confirm the inflator and cables are still there. Before winter trips, our guide on preparing for a winter storm covers planning.

Store the kit where you can reach it, and fasten it down as AAA advises. If you add a fire extinguisher, which AAA also lists, read our guide on keeping a fire extinguisher in a car first, since heat and mounting both matter. AAA also suggests keeping printed instructions in the kit for any item you are not familiar with, in case your phone is dead when you need them. Where safety is involved, such as jump-starting, jacking a car or standing near traffic, follow your vehicle owner’s manual and local officials.

If you do get stranded

The National Weather Service says, in its winter storm guidance:

Stay in the vehicle! If you leave your vehicle, you will become disoriented quickly in wind-driven snow and cold.

Source: National Weather Service, What To Do If You’re Caught in a Winter Storm (weather.gov), accessed November 2026.

That passage is about winter storms. In any emergency, follow local emergency officials and call 911, and when in doubt, don’t. The winter-driving guide linked near the top answers the engine-running and signaling questions in full, so we are not repeating them here.

Frequently asked questions

Are pre-made roadside kits worth it?

They can be, as a base. A boxed kit means you have something in the car, which beats a plan to build one later. Read the contents list, discount the piece count, and expect to add water, warmth and a way to start a dead battery on your own. If you want control over the quality of each item, build your own instead.

Do I need jumper cables or a jump starter?

AAA lists either. Cables need another car and a second driver. A jump starter works without one, which is why AAA points to it for drivers who would rather not rely on another vehicle. Whichever you choose, match it to your engine size and fuel type as the maker states them.

Do road flares expire?

The sources we found say road flares have no expiration date when stored properly. They also say to avoid long storage above 120 degrees Fahrenheit and to replace flares that are cracked, wet or have been stored hot. Check the condition, not a date.

Do I need warning triangles by law?

The federal warning-device rules we reviewed apply to commercial vehicles, not private cars. We did not check state laws, so look up your own state. Whatever the law says, Ready.gov lists flares or a reflective triangle in the car kit.

What should I add first to a kit I already bought?

Start with whatever its contents list lacks from the gap table above. For the example kit in this guide, that would mean water, a real blanket and a way to jump the battery without another car, followed by a hands-free light.

Our family emergency binder includes a car kit checklist with a winter version, which makes the twice-a-year check above easier to keep up.