Almost every emergency starts the same way: something breaks, and for a while nobody is coming to help. A storm takes the power and the roads. A water main goes and the tap runs brown. A wildfire jumps a ridge and you have ten minutes to be in the car. In all of them, the clock that matters is the first one, the stretch before the utilities come back or the trucks roll in, and the number the agencies keep repeating for that stretch is seventy-two hours.
A 72-hour kit is the answer to that window. It is one bag, packed ahead of time, that carries you and your household through three days without power, water, or a store. Not a bunker, not a year of buckets, just the few things that turn a bad three days into a manageable one. Here is what actually belongs in it, what tends to get packed and never used, and the habit that keeps the whole thing from quietly expiring in a closet.
Why three days, and what the kit is really for
The seventy-two hour figure is not arbitrary. It is roughly how long it takes emergency services to reach most people after a widespread disaster, and how long it takes utilities to start coming back online. Plenty of situations run longer, which is why a deeper pantry matters too, and we cover that in our guide on how much food to store for an emergency. But the first three days are the ones you are most on your own for, and they are the ones a grab bag is built to cover.
That framing matters because it decides what goes in. A 72-hour kit is not your whole preparedness plan; it is the fast, portable slice of it. Everything in the bag earns its place by being useful in the first three days and by being something you would not want to be hunting for while the lights are out. If an item fails either test, it belongs on a shelf, not in the bag.
The one rule: it has to be grab-and-go
The single most common mistake is building a kit you cannot actually leave with. The supplies get spread across three cabinets and the garage, so when the moment comes you are assembling it instead of grabbing it, and the whole point was to not do that. A real 72-hour kit lives in one container, by the door or in a closet near it, packed and closed.
Use a backpack or a duffel you can carry on your back, because half the scenarios that need this kit also need your hands free or your feet moving. A plastic tote works if you are sheltering in place and never leaving, but the bag is the safer default, since it covers both the stay and the go. Pack it so the things you would need first, water, a light, the documents, are near the top.
Water: the first thing in the bag
Water leads because it is the thing you run out of first and cannot improvise. The standard planning number is one gallon per person per day, which covers both drinking and basic hygiene, so a three-day kit for one person is three gallons. That is heavy and bulky, which is exactly why people shortchange it, and exactly why you should not. We go deep on containers, shelf life, and how to make more in our guide on how much water to store for an emergency.
For a portable kit, split the difference: pack what water you reasonably can, then add a way to make more drinkable. A small squeeze filter or a bottle of purification tablets weighs almost nothing and turns a questionable stream or tap into something safe, which stretches three packed liters into far more. The filter is the highest-value ounce in the whole bag.
Food that asks nothing of you
Kit food has one job: deliver calories with no cooking, no cold storage, and no fuss. The stove may be dead and the fridge is a warm box, so everything in the bag has to be edible straight from the package or with nothing more than the water you packed. Think calorie-dense and boring on purpose.
- Ready-to-eat staples: peanut butter, trail mix, nuts, jerky, granola or protein bars. High calories, long shelf life, zero prep.
- Canned goods with pull tabs: beans, tuna, chili, fruit. Pack a can opener anyway, because the one time it is not a pull tab is the time it matters.
- Just-add-water options: instant oatmeal, freeze-dried pouches, ramen. These lean on your water supply, so count that cost.
You are aiming for roughly 1,200 to 2,000 calories per person per day, and comfort counts more than you think when everything else is going wrong, so a little candy or a favorite snack is not wasted space. Skip anything salty enough to make you thirsty, since water is the one thing you are rationing.
The gear that is not food or water
This is where kits either come together or fall apart, because the list looks long but most of it is small and cheap. The trap is buying the exciting gear and skipping the dull essentials. A good rule: pack for light, warmth, information, and first aid before anything tactical.
| Category | What to pack |
|---|---|
| Light | A flashlight or headlamp per person, plus spare batteries. A headlamp wins, because it keeps your hands free. |
| Information | A battery or hand-crank radio, so you can hear alerts and instructions when the phone network is down. |
| Power | A charged power bank and a charging cable. Your phone is your map, flashlight, and contact list until the battery dies. |
| First aid | A stocked kit plus a few days of any prescription medication. Meds are the item people forget and cannot substitute. |
| Warmth | An emergency blanket per person, a change of clothes, and rain protection. Cold and wet turn bad situations dangerous fast. |
| Tools | A multi-tool, duct tape, a lighter or matches, and a whistle. Small, light, and each solves a problem you cannot predict. |
| Sanitation | Hand sanitizer, wet wipes, a roll of toilet paper, and trash bags. Unglamorous and the first thing you miss. |
Prescription medication deserves a second mention, because it is the one thing on this list you truly cannot improvise or borrow. If anyone in the house depends on a daily medication, a few days of it in the kit is non-negotiable, and rotating it so it stays current is part of the upkeep we get to below.
The documents and cash everyone skips
The least exciting part of the kit is the part you will be most grateful for if the worst happens. When your home is behind you and the systems you rely on are down, a slim folder of paper does work that no gadget can. Keep copies, not originals where you can, and seal them in a zip-top bag against water.
- Identification and records: copies of IDs, insurance policies, medical information, and prescriptions.
- Contacts on paper: a written list of phone numbers, because a dead phone takes your whole address book with it.
- Cash in small bills: when the power is out, card readers and ATMs are out too, and small bills mean you are not relying on anyone to make change.
The kit that gets used is not the one with the best knife. It is the one that is packed, reachable, and current on the morning you need it.
One kit per person, plus one in the car
Scale the plan to the people it protects. Each member of the household needs their own three days of water and food and their own warmth and light, so a family of four is planning for twelve gallons of water and a proportional stack of everything else, not one shared bag. Children need their own supplies too, plus a few things adults do not: diapers, formula, a comfort item. Do not forget pets, who need their own food and water in the count.
Then build a second, smaller kit for the car, because emergencies do not wait until you are home. A car kit does not need three full days, but a few liters of water, some shelf-stable food, a blanket, a flashlight, and a basic first aid kit turn a breakdown or an evacuation into a manageable one. The car is also where a lot of people spend an evacuation, so it is worth treating as a real part of the plan.
The part that actually fails: keeping it current
Here is the uncomfortable truth about 72-hour kits. Most of them are built once, shoved in a closet, and quietly rot. The water goes stale, the batteries corrode, the granola bars pass their date, the kids outgrow the spare clothes, and the medication in the bottle expired two years ago. A kit you cannot trust is worse than no kit, because it lets you believe you are ready when you are not.
The fix is rotation, the same discipline that keeps a deep pantry alive. Twice a year, pick dates you will remember, when the clocks change is the classic one, and open the bag. Check every date, swap anything expiring, cycle the water, test the flashlight and radio, and update clothes and documents for the season and the people. This is exactly the first-expired-first-out habit we lay out in our guide to food storage rotation, applied to a bag instead of a shelf.
While you are in there, do not panic over a recently passed date on the food. Most of those labels are about peak quality, not a hard safety line, a distinction worth understanding from our guide on what food expiration dates actually mean. The point of the twice-a-year check is not perfection; it is making sure that nothing critical, the water, the batteries, the medication, has silently failed while you were not looking.
Where an app quietly pulls ahead
A 72-hour kit is really just a small, portable inventory with expiration dates, and the reason kits go stale is the same reason any inventory does: the dates live in the bag where nobody sees them until it is too late. A checklist on paper builds the kit, but it cannot tell you in March that the water you packed is due to be cycled or that a medication is two weeks from expiring.
That is the line where StockWell takes over. Because it treats a go-bag as just another place you store things, you can log the kit once, set the expiration dates, and let it tell you what is due to rotate before it lapses, right alongside the pantry and the deep storage. The same system that answers what do I have on the shelf also answers the harder question a kit exists for: if I grabbed this bag right now, would everything in it still work? Build the kit this weekend, put it by the door, and give yourself a way to trust it is still ready the next time three days go sideways.
This guide is general preparedness information for a typical household, not medical, safety, or emergency-management advice. Follow the guidance of local authorities and, for anything involving medication or medical needs, your healthcare provider. See our Terms for more.