What should be in a 72-hour emergency kit?

Ready.gov and the American Red Cross recommend starting with water (one gallon per person per day for three days), a three-day supply of non-perishable food, a battery-powered or hand-crank radio, a flashlight with extra batteries, a first aid kit, a whistle, dust masks, sanitation supplies, a manual can opener, local maps, and a cell phone with backup chargers. Beyond those basics, the Red Cross recommends a seven-day supply of medications, copies of personal documents in a waterproof container, cash in small bills, and items for family members with special needs including infants or pets.

How much water does a 72-hour kit need?

Ready.gov recommends one gallon of water per person per day for drinking and sanitation. For a 72-hour kit, that means three gallons per person. A family of four would need twelve gallons for three days. The Red Cross distinguishes between evacuation and shelter-in-place: a three-day supply for evacuation and a two-week supply for staying home. Commercially bottled water with an intact seal can be stored until its marked expiration date. Water you store yourself in food-grade containers should be replaced every six months.

Should I buy a pre-built 72-hour kit or build my own?

Both approaches work, and each has trade-offs. A pre-built kit is faster to have ready, usually more compact, and covers a standardized list. Building your own lets you choose quality at every position, tailor items to your household, and avoid the padding that fills many commercial kits. The most practical path for most households is a hybrid: start with a pre-built kit for the container and basic structure, then evaluate each component and upgrade the items that matter most, starting with water, food, and any personal medications.

How often should I check and update my 72-hour kit?

Review your kit every six months. The two natural checkpoints are the spring and fall daylight saving time changes. At each review, check expiration dates on food and water, replace batteries, swap seasonal clothing if your climate changes between summer and winter, and update copies of personal documents. Prescription medications should be rotated as you refill them so the kit always has the most current supply.

How much does a good 72-hour kit cost?

Pre-built kits typically range from $40 to $200 depending on quality and the number of people covered. A single-person kit with adequate food, water pouches, a basic first aid kit, and essential tools generally runs $50 to $80. Building your own from individual purchases usually costs $100 to $250 for one or two people but produces a higher-quality result with longer shelf life on the food and better tools. The biggest variable is food quality: freeze-dried meals from reputable brands cost more than calorie bars but store longer and are more practical to eat during a real disruption.

72-Hour Kits: The Complete Buyer's Handbook (2026)

Start here

Three days on what you already have

A winter storm knocks out power and closes the roads. A flood pushes water into the streets between your neighborhood and the nearest store. The phone still works, but the shelves are already empty. In each case you are facing the same quiet math: can your household get through about three days on what is already under the roof.

That is the planning window behind a 72-hour kit. Ready.gov and the American Red Cross both use it as the baseline: three days of water, food, and essential supplies, enough to bridge the gap between the event and organized help arriving.^[1]^[2] Not a year of freeze-dried meals. Not a bunker. Three days of the things your household actually needs, packed before you need them.

Before you buy

Five questions about your own household

Answer these before you look at a single kit. They shape the purchase more than any brand or sale price.

1

How many people live here?

Water alone scales to three gallons per person for three days. A household of one needs a daypack. A household of five needs a bin or a set of bags. Count everyone, including regular overnight visitors.

2

Are you preparing to leave or to stay?

An evacuation kit lives in a bag you can carry out the door. A shelter-in-place kit can sit in a closet and weigh whatever it needs to. Many households benefit from both, and the two share about 80 percent of their contents.

3

Does anyone need daily medication?

The Red Cross recommends a seven-day supply in your kit, rotated as you refill prescriptions.^[2] If someone in the household depends on insulin, inhalers, or another time-sensitive medication, the kit is not optional and the medication is the first item in it.

4

Are there children or pets?

Infants need formula, diapers, and comfort items. Pets need food, water, and a leash or carrier. Both need current records: vaccination papers for the pet, identification documents for the child.^[1]

5

What is your budget range?

Pre-built kits run roughly $40 to $200. Building your own from individual purchases costs $100 to $250 for one or two people but produces a higher-quality result. The middle path is starting with a pre-built frame and upgrading the weak spots, which lands around $80 to $150 total.

The concept

What the 72-hour window actually means

The number comes from how long local and federal agencies typically need to establish organized relief after a regional emergency. Ready.gov uses three days as the planning baseline for household preparedness.^[1] That is the gap a kit is built to cover: from the moment normal supply chains stop to the point where stores reopen, utilities come back, or organized assistance reaches your area.

In practice, the window can be shorter or longer. A regional ice storm in a well-resourced area might clear in 36 hours. A major hurricane or earthquake has historically stretched past a week in some areas. The 72-hour kit is a starting floor, not a ceiling. The Red Cross recommends a three-day supply for evacuation and up to a two-week supply for sheltering in place at home.^[2]

A kit covers two scenarios. The first is sheltering in place: you stay home, the power may be out, and you cannot get to a store. The second is evacuation: you leave the house carrying what you can. The supplies for both overlap heavily. Water, food, documents, medications, light, and communication tools go in either version. The difference is weight and container. A shelter kit lives in a bin. An evacuation kit lives in a bag you can pick up and walk with.

The distinction that matters most

Pre-built or custom: what the choice really costs

This is the fork in the road that shapes everything else. Neither answer is wrong, but each carries real trade-offs that most listings gloss over.

Pre-built kits

Convenient and compact. Someone else chose the items, packed them, and tested the bag for weight. The kit is ready the day it arrives. The trade-off is quality at each position:

Food is often calorie bars or pouches with the minimum viable shelf life and calorie density. Many kits advertise 72 hours but contain 1,200 calories per day or less per person.
Water pouches may cover drinking but rarely sanitation. A kit that includes six 4-oz pouches is listing 24 ounces of water, not a gallon.
Tools are sometimes decorative. A compass you have never oriented, a whistle made of thin plastic, a flashlight with batteries already half drained.

Build your own

You pick quality at every position and tailor the contents to your household. The trade-off is cost and effort:

Individual items bought at quality usually cost two to three times what a pre-built kit charges for the same position. A real first aid kit alone can run $25 to $50.
You have to do the research. Which food stores for five years at room temperature. Which radio actually receives NOAA weather alerts. Which bag fits the weight you can carry.
Assembly takes an afternoon, and the kit reflects your household exactly: the right medications, the right number of meals, the right seasonal layers.

The hybrid path

Most households land between the two. Start with a pre-built kit for the container and the items that are hard to source individually (water pouches, compact rain gear, sealed bandages). Then audit each component against the five categories below. Upgrade the food, add your medications and documents, and replace any tool you would not trust in the dark. The result is a kit that was fast to start and reliable where it counts.

The real list

Five categories, in priority order

Every item in a kit belongs to one of these groups. If budget or space forces a trade-off, work down the list: water first, then food, then documents, then first aid, then everything else.

Water

One gallon per person per day for three days, for drinking and basic sanitation.^[1] That is three gallons per person. A family of four needs twelve gallons. Commercially sealed water pouches or bottles store longest. If you fill your own containers, use food-grade plastic and replace the water every six months.

For an evacuation bag, twelve gallons is roughly 100 pounds of water, which means you are choosing between full hydration and portability. Water purification tablets or a compact filter can close the gap if you will have access to a water source.

Food

A three-day supply of non-perishable, easy-to-prepare items.^[1] Target roughly 2,000 calories per person per day. That is 6,000 calories per person over three days. Calorie bars, freeze-dried pouches, canned goods (with a manual opener), peanut butter, dried fruit, and crackers are all viable. Check the math: if a kit says "72-hour food supply" but lists 3,600 total calories, it is covering half of what one person needs.

Shelf life matters more than taste. Freeze-dried meals from reputable brands store for 5 to 25 years at room temperature. Calorie bars typically last 5 years. Canned goods last 2 to 5 years. Whatever you choose, mark the expiration date on the outside of the kit.

Documents and cash

Copies of insurance policies, identification, bank account records, and medication lists in a waterproof, portable container.^[1] Include emergency contact numbers written on paper, because your phone may be dead. Cash in small bills covers the first few days when card readers are offline.

A sealed zip-lock bag inside the kit costs nothing and protects everything in it. Store a second copy of critical documents outside the home: a safe deposit box, a trusted relative's house, or an encrypted cloud backup.

First aid and medications

A basic first aid kit covers cuts, burns, and minor injuries. The Red Cross recommends a seven-day supply of prescription medications, along with over-the-counter pain relievers, antacids, and any daily vitamins.^[2] If someone in the household wears glasses or contacts, a backup pair belongs in the kit.

Rotate prescriptions with each refill so the kit always holds the most current supply. Write a medication list (name, dose, prescribing doctor, pharmacy) and keep it with your documents. In an evacuation, first responders and shelter staff need this information fast.

Light, communication, and tools

A flashlight with extra batteries, a battery-powered or hand-crank NOAA weather radio, a whistle, a manual can opener, local maps, and a cell phone charger (battery pack or hand-crank).^[1] Ready.gov also lists dust masks, plastic sheeting, and duct tape for sheltering in place when air quality is a concern.

Buy lithium batteries for the flashlight and radio. They hold charge in storage for 10 to 20 years, compared to 5 to 7 years for alkaline. A hand-crank radio removes the battery question entirely and usually includes a USB charging port for a phone.

Reading the label

What the listing should tell you

Most pre-built kit listings highlight the item count. "150-piece emergency kit" tells you almost nothing useful. These five numbers tell you everything.

1

Total calories per person per day

Divide the total calorie content by the number of people and by three days. If the answer is below 1,500 calories per person per day, the kit is marketing 72 hours but delivering less. A responsible listing states this number plainly.

2

Ounces of water per person

One gallon is 128 ounces. Three days at one gallon per person is 384 ounces. Many kits include a fraction of that. Count the water pouches and do the arithmetic before buying.

3

Food shelf life

Five years is the standard minimum for emergency food. Anything shorter means you are replacing the food on a cycle that most households will forget. Look for the manufacture date and the expiration, not just "long shelf life."

4

Total packed weight

An evacuation kit you cannot carry is a shelter kit by default. For a bag you plan to walk with, 15 to 25 pounds is the practical range for most adults. Heavier than that and it stays in the trunk, which is fine if that is the plan.

5

What is in the first aid kit

A "first aid kit included" line can mean 10 adhesive bandages in a plastic case or a 100-piece kit with trauma shears and an emergency blanket. The listing should itemize the contents. If it does not, assume the minimum.

Sizing

Matching the kit to your household

Water and food scale per person. Tools and documents scale per household. A kit for one person and a kit for four share the same flashlight, radio, and document folder, but the food and water multiply by headcount. Start with the per-person items and add a single set of shared tools.

Children under 12 need fewer calories but more comfort items. Include familiar snacks, a small game or book, and a comfort object. Infants need formula, bottles, diapers, and wipes in quantities that cover three days of actual use, not three days of hoping. Ready.gov recommends listing family-specific additions separately because they differ for every household.^[1]

Pets add food, water (half a gallon per day for a medium dog), a leash or carrier, waste bags, and a copy of vaccination records. If you evacuate to a public shelter, some shelters accept pets and some do not. Knowing which shelters in your area allow animals is a planning step, not a kit item, but the vaccination records are what gets your pet through the door.

Climate shapes the kit seasonally. A kit built in July may be missing warm layers, hand warmers, and an insulated water container that prevents freezing. A kit built in January may be missing extra water for heat and sun protection. Review the seasonal items at each six-month check and swap what the coming season requires.

What fails

The five ways a kit stops being useful

Most kit failures are not dramatic. They are slow, quiet, and discovered the day you actually need the kit. Each one is preventable with a single habit.

The kit that expired

Food passes its shelf date. Water in self-filled containers goes stale. Medications lose potency. The fix is a twice-yearly review at the daylight saving time changes: open the kit, check every date, replace what has passed, and mark the next review on a calendar.

The kit that was never opened

Batteries corrode in storage. Water containers develop slow leaks. Zipper pulls rust. The kit you bought and put on a shelf three years ago is not the kit you think you have. The same six-month check catches this: open the bag, lay everything out, and verify.

The untested assumption

The can opener that does not grip. The radio that receives AM but not NOAA weather bands. The water filter you have never used. Test every tool in the kit at least once before you seal the bag. Three minutes of testing now saves confusion during an actual disruption.

Too heavy to carry

A fully stocked four-person kit with three days of water weighs over 50 pounds before you add food. If the plan is to walk with it, you need a realistic test: pack it, put it on, and walk around the block. Adjust until the weight is something you can sustain for a mile.

The season mismatch

A kit packed in summer with no warm layers, or packed in winter with no sun protection or extra water. If your area has real seasons, the kit needs a seasonal layer that swaps at each review. A fleece, rain shell, and hand warmers for winter. Sunscreen, a hat, and an extra gallon of water for summer.

The compared field

Now that you know what to look for

Each comparison below reviews a real field of products for one type or use case, with a named pick and the reasoning behind it. Start with the type that fits the household you described at the top of this page.

Affiliate disclosure: New World Survival earns a small commission on purchases made through links in the comparisons below, at no cost to you. It helps cover operating costs and keep the guides current. Our picks are made on the merits. Commission never decides a recommendation.

After you buy

The plan behind the kit

A kit without a plan is a bag of supplies. These guides in our Planning section connect the kit to the decisions that make it useful.

Disaster response, step by step

What to do in the first hour after an event: who to contact, how to assess your situation, and when to shelter versus when to leave.

Read the guide

Documents and records

Which documents to copy, how to store them, and the system that keeps them current without a filing project every six months.

Read the guide

Hazard planning

How to identify the hazards specific to your area and adjust your kit and plan accordingly. A flood zone kit is not the same as an earthquake zone kit.

Read the guide

Household continuity

The broader plan that the kit serves: how to keep your household running through a disruption, from communication to finances to daily routines.

Read the guide

Products in this guide

Every comparison, in one place

The full field we have published for this category. New comparisons appear here as they are built.

72-hour kits, explained before you spend.

Three days on what you already have

Five questions about your own household

What the 72-hour window actually means

Pre-built or custom: what the choice really costs

Five categories, in priority order

What the listing should tell you

Matching the kit to your household

The five ways a kit stops being useful

Now that you know what to look for

The plan behind the kit

Every comparison, in one place

Sources