How to Build a Go Bag: The 72-Hour Emergency Kit Guide

A go bag — sometimes called a bug-out bag or 72-hour kit — is a pre-packed bag that contains everything you need to survive for three days away from home during an emergency evacuation. It is the single most universally recommended emergency preparedness item across FEMA, the Red Cross, and every credible emergency management organization. Yet studies consistently show that fewer than 40% of American households have one.

The reason most people do not have a go bag is not that they do not care about preparedness. It is that they get overwhelmed by conflicting advice, overly long checklists, and the impression that doing it "right" requires hundreds of dollars and a military background. It does not. This guide walks you through building a practical, effective go bag in three budget tiers, with clear priorities so you can start with $50 and upgrade over time.

Before You Pack: Planning Your Go Bag

Choosing the Right Backpack

Your go bag's container matters almost as much as its contents. Here is what to look for:

The Weight Rule

Your go bag should not exceed 20-25% of your body weight. For a 160-pound person, that means a maximum of 32-40 pounds — and lighter is better. A bag you cannot carry for a mile is a bag you will leave behind. Prioritize ruthlessly: water, shelter, medical, then everything else.

Who Needs a Go Bag

Every adult and older child (roughly age 10+) in your household should have their own bag. Young children cannot carry their own supplies, so their items get distributed among adult bags. Do not forget pets: pack food, medications, vaccination records, a leash, and a carrier. Each family member's bag should contain their personal medications, a change of clothes, and any special items they need (glasses, hearing aid batteries, infant formula).

Building Your Go Bag: The Complete Checklist

Tier 1: Essentials ($50–$100)

If you have $50 and an afternoon, you can build a go bag that covers the fundamentals. Start here.

Water and Food:

Shelter and Warmth:

Light and Communication:

Medical and Hygiene:

Documents and Cash:

Tier 2: Solid Prep ($100–$300)

Add these items to upgrade your survival comfort and self-sufficiency significantly.

Tier 3: Fully Prepared ($300–$1,000+)

For comprehensive preparedness that covers extended evacuations and worst-case scenarios.

Special Considerations

For families with infants:

For those with medical needs:

For pet owners:

During an Evacuation: Using Your Go Bag

When the moment arrives, here is how to make the most of your preparation:

After the Emergency: Maintenance

A go bag is only as good as its most recently replaced component. Schedule a review every six months:

  1. Replace expired food, water, and medications.
  2. Charge or replace batteries in flashlights, radios, and power banks.
  3. Swap seasonal clothing (lighter layers for summer, warmer layers for winter).
  4. Update documents: new insurance cards, changed emergency contacts, updated IDs.
  5. Check that cash is still present and sufficient.
  6. Replace anything you have borrowed or used from the bag.
  7. Adjust for family changes: new baby, new medication, child has outgrown clothing.

Official resources:

Frequently Asked Questions

What is a go bag and why do I need one?

A go bag (also called a bug-out bag or 72-hour kit) is a pre-packed bag containing everything you need to survive for 72 hours away from home during an emergency evacuation. You need one because disasters like wildfires, hurricanes, and chemical spills can require immediate evacuation with little warning. Having a pre-packed bag means you can be out the door in under five minutes.

How heavy should a go bag be?

A go bag should weigh no more than 20-25% of your body weight if you may need to carry it on foot for an extended distance. For most adults, aim for 15-30 pounds. If the bag is too heavy to carry comfortably for a mile, remove lower-priority items. A bag you cannot carry is a bag that gets left behind.

What backpack should I use for a go bag?

Use a durable, water-resistant backpack with padded shoulder straps and a hip belt. A 40-60 liter hiking backpack works well. Look for MOLLE webbing for attaching external items, multiple compartments for organization, and a hydration bladder pocket. Dark or earth-tone colors are practical. Avoid tactical/military-style bags if you want to blend in during an evacuation.

What food should I put in a go bag?

Pack food that is lightweight, calorie-dense, requires no cooking, and has a long shelf life: energy bars, trail mix, peanut butter packets, jerky, freeze-dried meals (if you carry a way to heat water), hard candy for quick energy, and electrolyte drink mix packets. Aim for 2,000-3,000 calories per person per day. Replace food every 6-12 months.

How much water should be in a go bag?

Carry at least one liter of water per person and include water purification tablets or a portable filter to treat additional water from natural sources. Three days of water (one gallon per person per day) weighs over 24 pounds, which is too heavy for most go bags. The solution is to carry a small amount of water plus the ability to purify more.

Where should I store my go bag?

Store your go bag in the most accessible location in your home — near the front door, in a hall closet, or in your car trunk. It should be grabbable in under 30 seconds without searching. Some people keep one bag at home and a smaller version in their car. Do not store it in a locked storage unit, a basement that might flood, or anywhere you cannot reach quickly.

How often should I update my go bag?

Review and update your go bag every six months. Replace expired food and water. Update medications. Swap seasonal clothing (summer vs. winter). Check that batteries and power banks are charged. Verify that all documents are current. Replace anything you have used or removed. Set a recurring calendar reminder — January and July are common choices.

Do I need separate go bags for each family member?

Ideally, yes. Every adult and older child should have their own bag with personal items (medications, glasses, clothing). You can centralize shared items like the first aid kit, water filter, and firestarter in one bag. Young children cannot carry their own supplies, so distribute their items across adult bags. Do not forget go bags for pets: food, medications, vaccination records, leash, and a carrier.

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