TL;DR
A 72-hour bug-out bag contains water and purification, food, shelter and warmth, first aid, communication, navigation, light, fire, and critical documents. That's the full list. Everything else is category-specific depth or luxury. Build the bag around the scenarios you're likely to face: urban evacuation to a family member's house, not a 30-day wilderness survival expedition.
The Realistic Bug-Out Scenario
Before building the bag, be honest about what you're preparing for. Most people's realistic bug-out scenario is:
- Leave home due to natural disaster (wildfire, hurricane, flood, earthquake)
- Travel 50-300 miles by car (or on foot if roads are impassable)
- Arrive at a family member's home, a motel, or an organized shelter
- Be self-sufficient for 72 hours in case of delay or unexpected conditions
This is different from the wilderness survival scenario that drives most bug-out bag content. You probably don't need snare wire. You probably do need your important documents and a phone charger.
Build for your scenario.
The Core Categories
Water (non-negotiable)
Minimum 1 liter per person per day = 3 liters for 72 hours. Water is the heaviest item, but you die within 3 days without it.
- Pre-filled water bottles: 3 liters = 6.6 lbs. Heaviest but simplest.
- Water filter (Sawyer Squeeze, LifeStraw): 2 oz, treats unlimited water from any source. Pair with 1-2 liters pre-filled.
- Water purification tablets (Aquatabs): 0.5 oz, 50 tablets. Backup purification.
Food
Approximately 1,500-2,000 calories per day for an active adult. You can function on less for 72 hours.
- Emergency ration bars (Mainstay, Datrex): 3,600 calories in one sealed bar, 5-year shelf life, $8. Ugly but functional.
- Mountain House or similar freeze-dried meals: lighter, better taste, require water and a stove.
- High-calorie snacks (nut butter packets, nuts, jerky, granola bars): familiar, no preparation, 200-300 cal each.
Don't overthink food. You're surviving for 72 hours, not eating well. Calories and simplicity.
Shelter and Warmth
- Emergency bivy or emergency blanket (SOL Escape bivy, $30): reflects 90% of body heat, weighs 4 oz. Better than a Mylar blanket.
- Rain poncho: doubles as ground cover, pack cover, and water collection.
- Base layer change: dry socks and a dry layer is more important than an extra jacket.
Tent or tarp are optional. The emergency bivy handles temperature survival; a full shelter setup adds significant weight for a 72-hour scenario.
First Aid
A complete first aid kit (IFAK or comprehensive kit) including:
- Tourniquet (CAT or SOFTT-W): non-negotiable
- Wound packing gauze (QuikClot or Combat Gauze)
- Pressure dressing
- Adhesive bandages, antiseptic, tape
- Medications: OTC pain relief, antihistamine, antidiarrheal
- Personal prescription medications: 72-hour supply minimum
First aid is where most bug-out bags are underprepared. The scenario that triggers a bug-out often involves injury risk — natural disasters, vehicle accidents during evacuation, physical stress. A band-aid kit isn't sufficient.
Communication
- Fully charged phone + portable power bank (10,000 mAh minimum)
- Charger and cables
- Laminated emergency contact card (in case phone fails)
- GMRS or ham radio: optional but recommended (see communications section)
- Hand-crank NOAA weather radio: receives emergency alerts without cell service
Navigation
- Physical map of your area (pre-printed, waterproofed)
- Compass (baseplate, $15-20)
- Offline maps on phone (Gaia GPS or similar)
Don't rely solely on phone navigation — phones die, lose signal, and fail. Physical map and compass are 100% reliable.
Light
- Primary headlamp with fresh batteries + spare batteries
- Backup flashlight or chemical light sticks
Fire
- Lighter (BIC) — 1 primary, 1 backup
- Waterproof matches in a sealed container
- Ferrocerium rod
You probably won't need to start a fire in a 72-hour urban evacuation. But in a scenario where you're delayed in rough weather, fire is essential for warmth and morale.
Critical Documents
- Copies of: ID/passport, birth certificates, insurance cards, prescription list, financial account numbers, property documents
- USB drive with digital backups of the above
- Emergency cash: $100-200 in small bills. ATMs fail when power fails.
This is the most overlooked category and among the most practically important. You will need ID at a shelter. You will need insurance information at a hospital. Documents don't weigh much; not having them is expensive.
Weight Management
Target bag weight for a capable adult: 25-35 lbs with water, less without.
Weight audit by category:
- Water (2 liters pre-filled + filter): ~5 lbs
- Food (3-day rations): 3-4 lbs
- Shelter (bivy, poncho, dry layer): 2-3 lbs
- First aid kit: 1-2 lbs
- Electronics (phone, power bank, charger): 1-2 lbs
- Navigation (map, compass): 0.5 lbs
- Light: 0.5 lbs
- Fire: 0.2 lbs
- Documents, cash, misc: 0.5 lbs
- Bag itself: 2-4 lbs
Total: approximately 17-23 lbs without the heaviest water load. Manageable for most adults; excellent for 10+ mile carries.
What to Leave Out
Common bug-out bag items that add weight without commensurate value for the typical scenario:
- Multi-tools heavier than 5 oz when a small fixed blade serves better
- Full survival knife when a simple utility knife and multi-tool is sufficient
- Extensive cordage beyond 30-50 feet of paracord
- Tactical gear that doesn't serve a survival function
- More than 3 days of food (you're carrying 72 hours of need, not 30 days)
- Heavy camping gear (stove, cookpot, full tent) unless your scenario specifically requires wilderness survival
Every pound you add is a pound you carry. The bag you leave in the closet because it's too heavy is not preparation — it's a prop.
Testing and Maintenance
Test the bag: Put it on and walk 5 miles. If you can't complete 5 miles, the bag needs to be lighter or you need more fitness. Both are legitimate responses.
Rotate consumables: Water every 6 months. Food on its expiration schedule. Batteries annually. Check that everything is functional.
Update documents: Annual review of the document copies — expired IDs, changed insurance, updated prescriptions.
The bag that hasn't been opened in 3 years has rotted food, dead batteries, and expired medications. It's not a bug-out bag; it's an anxiety prop. Maintain it like the tool it is.
Sources
Frequently Asked Questions
How heavy should a bug-out bag be?
The load you can carry at a reasonable pace for 10-15 miles. For most adults in reasonable fitness, that's 25-35 lbs. For someone less fit, older, or with physical limitations, less. A 60-lb tactical bag that you load 'in case' is not a bug-out bag — it's a decoration. Test your bag: put it on and walk 3 miles. If you're miserable after 3 miles, the bag is too heavy and you will abandon it or be incapacitated. Build toward the bag you'll actually use.
What's the most common thing people forget?
Medications. Specifically, chronic maintenance medications that many people don't think of because they take them daily and they're just part of the routine. Insulin, blood pressure medication, thyroid medication, psychiatric medications — these are not optional for the people who need them. A 72-hour supply should be in the bag and rotated when refilled. The second most common omission: copies of critical documents (ID, insurance, prescriptions).
Should I have one bag for the whole family or individual bags?
Individual bags for each adult and capable teenager; a shared bag for small children's needs carried by adults. Every capable adult should be able to carry their own survival needs independently — if you're separated, each person needs to be self-sufficient. Children's bags are typically a small pack with personal items, comfort items, and their own documents; their survival needs are carried by adults.