A 72-hour bag is a portable emergency kit stocked with supplies to keep you safe for at least three days after a disaster.
When disaster strikes — a hurricane, earthquake, or extended power outage — stores close, water lines fail, and emergency services get stretched thin. A 72-hour bag, sometimes called a go-bag or bug-out bag, covers you and your household during that critical window. The name comes from the standard emergency-preparedness guideline: be ready to survive on your own for a minimum of 72 hours after a crisis begins. The goal isn’t long-term self-sufficiency; it’s bridging the gap until help arrives or conditions stabilize.
What Should Go Inside a 72-Hour Bag?
The U.S. federal government’s Ready.gov program publishes the definitive basic emergency supply checklist. It calls for enough supplies to last “several days,” with water and non-perishable food as the foundation. At minimum, your kit should include:
- Water: One gallon per person per day for drinking and sanitation. For three days, that’s three gallons per person.
- Food: A several-day supply of non-perishable items like canned goods, protein bars, and dried fruit — plus a manual can opener.
- Light and communication: A flashlight, a battery-powered or hand-crank radio with NOAA Weather Radio tone alerts, and extra batteries.
- Health and safety: A first aid kit, whistle, dust mask, plastic sheeting, and duct tape for sheltering in place.
- SANITATION: Wet wipes, garbage bags, and plastic ties for personal hygiene.
- Tools: A wrench or pliers to shut off utilities, plus local maps in case GPS fails.
- Personal items: A phone charger with a backup battery, cash, and a change of clothes.
Ready.gov also stresses adding prescription medications, glasses, infant formula and diapers, pet food, important documents in a waterproof container, and extra bedding for cold climates.
How to Build and Store Your Kit
You do not need to buy a pre-made kit, though commercial options exist and vary widely in contents and price. Assembling your own lets you tailor it to your family. Store everything in airtight plastic bags, then keep the whole kit in one or two easy-to-carry containers — a plastic bin or duffel bag works well. The key is keeping it accessible: if you need to leave in a hurry, the bag should be grab-and-go ready near an exit.
If you’re preparing for the whole household, remember that each family member benefits from their own kit, adjusted for their needs — kids, older adults, and pets each have specific requirements. After you assemble it, build a habit of rotating perishable food and refreshing batteries and medication expiration dates every six months or so. The most common failure isn’t a missing item; it’s a stale one.
The Ready.gov emergency supply checklist is the complete federal guide and the best starting point for anything you’re unsure about.
What Are the Most Common Mistakes?
Most people underpack water and food, then forget the non-obvious essentials. Here’s where kits typically fail:
- Not enough water: One gallon per person per day is the floor, not the target. Many households pack half that.
- No way to stay informed: A radio is useless without batteries, and phones die fast without a backup charger.
- Missing daily meds and documents: Prescriptions and IDs are the hardest things to replace during an emergency.
- No pet or baby supplies: Government guidance emphasizes separate kits for every family member, including pets.
The fix is simple: use the checklist, pack for real needs, and rotate what expires. If you’d rather start from a tested foundation instead of building from scratch, our roundup of the best 72-hour bags covers ready-made options that meet these standards out of the box.
The Bottom Line
A 72-hour bag isn’t about preparing for the apocalypse — it’s about the first three days after a disruption, when help may be slow and stores are dark. Pack water, food, light, communication, first aid, and your personal necessities; keep it airtight, accessible, and fresh. That small investment turns a chaotic situation into a manageable one.
FAQs
How much water should be in a 72-hour kit?
Plan for one gallon per person per day, covering both drinking and basic sanitation. For a three-day kit, that’s three gallons per person. If you have pets, add their needs too, and consider a water filter or purification tablets as a backup.
Can I buy a pre-made 72-hour bag instead of building one?
Yes, pre-made kits are widely available, but contents and quality vary significantly by brand. A commercial kit can be a solid starting point as long as you check it against the Ready.gov checklist and add personal items like medications, glasses, and important documents that generic kits won’t include.
How often should I update my emergency bag?
Review your kit every six months. Rotate canned food and other perishables before they expire, replace used or expired batteries and medications, and swap out seasonal clothing as weather shifts. A good rule of thumb is to check it when you change your clocks for daylight saving time.
References & Sources
- Ready.gov. “Build A Kit.” The official U.S. federal checklist for basic emergency supplies, including water, food, tools, and sanitation items.