Road trip packing fails differently to other packing. You are not going to a place with stores nearby and a base to return to — you are going to be four hours from anywhere at the exact moment you need the thing. So the list is less about comfort and more about not being stranded.
Three lists, really, and they are worth keeping separate.
The car
Checked before you leave, not discovered on a shoulder.
- Jumper cables or, better, a lithium jump pack that does not need a second car
- Tire inflator that runs off the 12V outlet, and a pressure gauge
- Tire sealant or a proper spare, and the tools to fit it
- Reflective triangles and a safety vest
- Flashlight, ideally a headlamp, and spare batteries
- Washer fluid, motor oil to match your car, a funnel
- Gloves, a rag, zip ties, duct tape
- Phone mount and a multi-port 12V charger
- Ice scraper if there is any chance of it, because there always is
The people
- Water — more than you think, per person, plus refillable bottles
- Snacks that survive heat. Chocolate does not
- Paper towels, wet wipes, hand sanitizer, trash bags
- Sunglasses, sunscreen — a windshield is not sun protection
- Travel pillow, blanket, eye mask for whoever is not driving
- Motion sickness tablets, pain reliever, bandages
- Cooler bag for anything that has to stay cold
- Downloaded music and maps, for the ninety minutes with no service
- Cash and coins for tolls and parking that are older than tap-to-pay
The emergency box
Kept in the trunk, ignored for years, then extremely useful once.
- First-aid kit, restocked rather than assumed
- Emergency blanket, spare warm layer
- Bottled water and long-life food
- Portable charger, charged before you leave
- Paper map of the region. Yes, paper
- Fire extinguisher, small
- Printed copies of insurance and roadside assistance details
Why it should be a link everyone in the car has
Packing lists live with the person who wrote them, which is a problem when the person who wrote them is driving. Building it as a shared link means whoever is in the passenger seat can check it, and whoever is doing a grocery run before you leave is buying from the same page.
On MakerManifest each item comes from a product page, so the list shows the actual jump pack, the actual inflator. That matters for car gear more than most categories — half of it is spec-sensitive, and "get a tire inflator" is how you end up with one whose hose will not reach the rear tires.
Use the note on each item for the details that decide it: "12V, needs a long hose", "5W-30 for our engine", "already in the trunk". Split it across a few lists if it runs long — a free account gives 10 lists of 25 items, and car / people / emergency is a natural three.
Publish it, send the link. No account needed at the other end, works on a phone, opens in a browser.
Build it once, reuse it forever
The emergency box list in particular is worth keeping permanently. Once a year you open the link, check what has expired or been used, and restock. That is the whole maintenance routine, and it is the difference between a trunk box you trust and a trunk box you hope about.
Start your road trip list — free, and shareable with the whole car.