Bug-out bag

A bug-out bag is a pre-packed kit that lets you leave home fast and sustain yourself for 72 hours without resupply. The 72-hour figure comes from emergency management guidance: most localized disasters — floods, wildfires, gas leaks, chemical spills — resolve within three days. If they don't, you need a destination with resources, not more gear in your pack.

The common failure mode is overpacking. Bags that weigh more than 20% of your body weight dramatically slow your movement, accelerate fatigue, and increase injury risk on rough terrain. For a 150-pound (68 kg) person, that ceiling is 30 pounds (14 kg) loaded. For someone not in strong physical condition, the practical limit is closer to 20 pounds (9 kg). A bag you cannot move fast in is not a bug-out bag — it is a very expensive anchor.

Action block

Do this first: Calculate your pack weight ceiling — multiply your body weight by 20% and write that number on a sticky note before buying or packing anything (5 min) Time required: Active: 5 min for weight ceiling calculation; 2–4 hours to assemble and test-pack the full kit; 1-hour loaded walk twice yearly for maintenance Cost range: Inexpensive for navigation and fire kit; affordable for a complete 72-hour food and water kit; moderate investment for a quality pack with hip belt and a full shelter system Skill level: Beginner for assembling and packing; intermediate for seasonal loadout adjustment and navigation by map and compass Tools and supplies: Tools: bathroom or luggage scale (for the weighing action), 40–65 L pack with padded hip belt, squeeze or straw water filter, ferro rod, lighter, baseplate compass, headlamp, emergency radio, tourniquet, hemostatic gauze. Supplies: water purification tablets, collapsible flask, paracord, waterproof matches in sealed container, 6,000–7,200 calories shelf-stable no-cook food, pressure bandage, personal medications, spare batteries. Infrastructure: tarp (minimum 6×8 ft (1.8×2.4 m)), closed-cell foam pad, emergency bivy, laminated paper map of local area. Safety warnings: See Ground insulation matters more than overhead cover in cold below — cold ground conducts heat 25× faster than cold air; skipping a foam pad in cold weather is a hypothermia risk

What size bug-out bag do I need?

The bag itself matters more than most people acknowledge. A pack that doesn't fit transfers load to your shoulders instead of your hips, and shoulder-carried weight is two to three times more tiring per pound than hip-carried weight.

Look for a pack in the 40 to 65 liter range. Below 40 liters you'll struggle to fit core items without strapping gear to the outside, which makes it rain-vulnerable and snaggable in dense cover. Above 65 liters and the temptation to fill it wins — you'll end up at 45 pounds (20 kg) and know it was a mistake on day two.

Key fit features: padded hip belt (this is not optional — it transfers 60 to 80% of weight off your shoulders), adjustable torso length, sternum strap, load lifters at the top of the shoulder straps. A pack without a hip belt is a daypack. If you are loading it with 72 hours of gear, it needs a hip belt.

Pack color: earth tones and muted greens blend. Black stands out in daylight against almost every natural background. Bright colors are for search-and-rescue situations. Choose accordingly.

The six essential categories

Water

Carry 1 liter (34 oz) of ready-to-drink water as an immediate supply — enough for the first few hours before you can source more. Do not carry 3 liters of water from the start unless your route has no natural sources; water weighs 2.2 pounds per liter (1 kg/L) and is the heaviest item in any pack.

Include a water filter rated to handle bacteria and protozoa — a squeeze filter or straw filter adds under 3 ounces (85 g) and allows you to drink from streams, ponds, and ditches. Back it up with a small supply of purification tablets: a bottle of 50 tablets weighs almost nothing and treats 50 liters. If your route crosses a nuclear, chemical, or industrial contamination zone, neither filtration nor tablets help — plan alternate water sources before you need them.

A collapsible 1-liter soft flask weighs under 1 ounce (28 g) and lets you carry and treat water without a rigid bottle taking up pack volume when empty.

Food

Plan 2,000 to 2,400 calories per day. For 72 hours, that is 6,000 to 7,200 calories total. The key constraints are weight, shelf life, and no-cook usability — assume you may not be able to build a fire.

Calorie-dense options that pack well: - Trail mix or mixed nuts: roughly 160 calories per ounce (5.6 cal/g) - Commercial energy bars: 200-300 calories per bar at 2-3 ounces (57-85 g) - Peanut butter packets: portable, high calorie, no refrigeration needed - Hard cheese and crackers: good for days one and two before spoilage - Freeze-dried meals: ideal but heavier and require boiling water

A realistic 72-hour food kit targeting 6,000 calories weighs 3 to 4 pounds (1.4 to 1.8 kg) if you prioritize calorie density.

Shelter and sleep

You need something to keep you out of rain and wind and off the cold ground. A lightweight tarp — 6 feet by 8 feet (1.8 by 2.4 m) — and a 550 paracord ridge line weighs under 1.5 pounds (680 g) and shelters one to two people from rain in multiple configurations. Add a mylar emergency bivy (7 oz (200 g)) for warmth when sleeping in cold conditions.

If temperatures where you operate regularly drop below 40°F (4°C) overnight, a lightweight sleeping bag rated to 20°F (-7°C) is the safer choice despite the added weight (2 to 3 lbs / 0.9 to 1.4 kg). Hypothermia kills. A mylar bivy is a supplement to insulation, not a substitute for it.

Ground insulation matters more than overhead cover in cold

Cold ground conducts heat away from your body 25 times faster than cold air. A tarp overhead does nothing for heat loss through the ground. A closed-cell foam sleeping pad at 14 ounces (400 g) provides more thermal protection per dollar than almost any other item in the pack. Do not skip it in cold climates.

First aid

A full first aid kit is covered separately on the individual first aid kit page, but your bug-out bag kit should at minimum contain:

  • Tourniquet (CAT or SOFTT-W) — this is the single most important trauma item
  • Hemostatic gauze (4-inch / 10 cm roll)
  • Pressure bandage
  • Adhesive bandages in assorted sizes
  • Medical tape
  • Nitrile gloves (two pairs minimum)
  • Personal medications in a 72-hour supply — labeled, in original containers if possible
  • Blister treatment (moleskin or blister bandages)

Weight target for this kit: under 1.5 pounds (680 g).

Fire and light

Fire provides warmth, water purification (boiling), and psychological comfort. Carry three ignition methods: a disposable lighter, a ferro rod, and waterproof matches in a sealed container. Each weighs under 1 ounce (28 g); the redundancy is worth the weight.

A headlamp with fresh batteries or a rechargeable USB headlamp is essential. Keep a spare set of batteries in your bag. Modern LED headlamps run 40 to 100 hours on a single set of AA batteries — runtime matters more than brightness for sustained use.

Field note

Store your lighter, matches, and ferro rod together in a small zip-lock bag inside your first aid kit, not loose in a side pocket. When you need fire, you need it urgently, and you need all three options in one place. Side pockets get reorganized; a kit inside the main compartment does not.

A printed paper map of your operating area — your home county plus the counties you might evacuate through — weighs nothing and works when your phone battery dies. Laminate it or store it in a zip-lock bag. A baseplate compass costs almost nothing and lasts decades.

A National Oceanic and Atmospheric Administration (NOAA)-compatible emergency radio with hand crank or solar charging gives you situational awareness when cell networks are down. Many models weigh under 8 ounces (226 g) and double as flashlights and phone chargers via USB.

Cash in small bills (fives and tens) is genuinely useful in power outages when card readers fail. Keep a fixed amount sealed in your bag's document pocket and do not spend it casually.

Include copies of critical documents in a waterproof sleeve: ID, insurance cards, medication list, emergency contacts, property records if you own a home.

Packing strategy

Pack weight distribution: heavy items (food, water, shelter) should ride against your back and high in the pack, close to your shoulders. Lighter items go at the bottom and in outside pockets. A pack that hangs weight low behind you pulls your center of gravity backward and is exhausting to carry.

Organization matters. Pack by use frequency: things you need every hour (water, snacks, headlamp) go in outside pockets. Things you need at camp (shelter, sleeping system) go at the bottom of the main compartment. First aid and navigation tools go in a consistent location you can find in the dark.

Field note

Run a 1-hour walk with your fully loaded bag at least twice a year. You will discover the pressure points, the rattles, and the items you reach for constantly. You'll also know whether you can actually move at the pace your plan requires. Bags built purely in garages tend to have problems that only appear on feet.

How often should I check my bug-out bag?

The most common bug-out bag failure is the bag packed years ago and never touched since. Batteries die. Food expires. Medications run out. Seasonal layering becomes wrong for the current month.

Establish a twice-yearly inspection: check battery charge, rotate food at or near expiration, verify medications are current and stocked, adjust clothing layers for seasonal conditions, and confirm all components are present. Spring and fall are natural timing anchors.

Store the bag somewhere you can grab it in under two minutes. The bedroom closet beats the basement storage room for this purpose. The bag that is stored "safely away" is often not accessible when time matters.

Seasonal loadout adjustment

A bag packed in August will kill you in January if you never touched it. The core categories stay constant; what changes is the shelter system, the water strategy, and the caloric density of your food — and those changes are significant enough to matter.

Weight discipline: base weight vs. consumable weight

Base weight is everything in the bag that you carry the entire 72 hours: shelter, fire kit, navigation, first aid, clothing layers. This should be as low as you can get it without compromising function.

Consumable weight is food and water — items that get lighter as you move. This is where seasonal strategy shifts most.

Category Summer target Winter target
Base weight (shelter + layers) 8–12 lbs (3.6–5.4 kg) 12–18 lbs (5.4–8.2 kg)
Water carry 2 liters (4.4 lbs (2 kg)) 1 liter (2.2 lbs (1 kg)) insulated
Food (72 hr) 3–4 lbs (1.4–1.8 kg) 4–5 lbs (1.8–2.3 kg)
Total loaded target 20–25 lbs (9–11 kg) 25–35 lbs (11–16 kg)

Summer adjustments

In summer, heat is the threat and water availability is the opportunity. Natural sources are more accessible, so you can carry less water and rely more on your filter and tablets. Reduce your carry from 2 liters to 1 liter if your route passes reliable water sources every 4 to 6 hours — you'll refill more often and carry less weight.

Shelter becomes lighter: a tarp plus emergency bivy replaces the sleeping bag for most climates above 50°F (10°C) overnight. Sun protection enters the kit — a lightweight long-sleeve shirt and a wide-brim hat weigh under 8 oz (226 g) combined and prevent heat exhaustion during a full-day carry.

Food caloric density matters less in summer because your body is not fighting cold. Standard energy bars and trail mix are adequate. Avoid chocolate-based bars above 85°F (29°C) — they melt and foul other gear.

Winter adjustments

Cold is unforgiving on a timeline that summer heat is not. A wet and cold person without adequate insulation becomes incapacitated in 2 to 4 hours. The shelter system upgrades are non-negotiable:

  • Replace the mylar bivy with a sleeping bag rated at least 15°F (-9°C) below the coldest overnight temperature you expect
  • Add a closed-cell foam pad if you don't already carry one — ground insulation is the first priority in cold weather, not overhead cover
  • Include a waterproof shell layer (jacket and pants) even if rain is not forecast — wet clothing in cold temps is the fastest path to hypothermia

Water strategy shifts: natural sources may be frozen. Carry a wider-mouth bottle that accepts ice chunks for melting, and know that melting snow requires fuel — factor this into your fire kit.

Caloric density increases in winter because cold-weather travel burns significantly more calories — estimate 2,500 to 3,000 calories per day instead of 2,000. Add high-fat, cold-tolerant foods: nuts, hard salami, hard cheese (good for 3–5 days unrefrigerated in cold weather), and nut butter packets. Freeze-dried meals are viable if you have the fuel to boil water.

72-hour consumption plan by category

Use this to verify your kit before deploying — count what you have and compare against what you'll need:

Category Day 1 Day 2 Day 3 Notes
Water (purified) 3 L (3.2 qt) 3 L (3.2 qt) 3 L (3.2 qt) Drinking + cooking; more in heat/exertion. FEMA's storage standard of 1 gal (3.8 L) per person per day includes sanitation — that's a stored-at-home figure, not what you carry.
Calories 2,000–2,400 2,000–2,400 2,000–2,400 Add 20–30% for cold weather
Fire starts 1 primary Backup carried Backup carried 3 methods total, accessible
Light (hours) 4–6 hr runtime Same Same LED headlamp with lithium batteries
Medications Day 1 dose Day 2 dose Day 3 dose Plus 24-hr buffer for delays

The 72-hour plan is a maximum-duration frame. Most evacuations resolve sooner. If they don't, your destination — not your bag — provides the next layer of supply.

Bug-out bag readiness checklist

  • Choose a 40-65 liter pack with a padded hip belt and adjustable torso length
  • Verify total loaded weight does not exceed 20% of your body weight
  • Water: 1 liter ready-to-drink, filter rated for bacteria and protozoa, purification tablets
  • Food: 6,000-7,200 calories, no-cook capable, shelf-stable at least 1 year
  • Shelter: tarp minimum 6 x 8 feet (1.8 x 2.4 m), paracord ridgeline, closed-cell foam pad
  • First aid: tourniquet, hemostatic gauze, pressure bandage, personal medications
  • Fire: lighter, ferro rod, waterproof matches — all in one dedicated bag
  • Light: headlamp with spare batteries or rechargeable unit
  • Navigation: paper map of your area laminated or in waterproof sleeve, compass
  • Communication: emergency radio, cash in small bills, copies of critical documents
  • Inspect and rotate contents twice yearly — spring and fall

Your bug-out bag covers the first 72 hours. For day-to-day readiness when you are away from home, the get-home bag handles the gap between your workplace and your house. For the items you carry on your person regardless of bag availability, the everyday carry page covers what belongs in your pockets.

Sources and next steps

Last reviewed: 2026-05-17

Source hierarchy:

  1. FEMA Ready.gov — Build a Kit (Tier 1, federal emergency management; 72-hour kit guidance and core category list)
  2. FEMA Ready.gov — Water (Tier 1, federal; water quantity, purification, and storage guidance for emergency kits)

Legal/regional caveats: (none) — no legal or jurisdictional requirements govern personal emergency kit contents in the United States. Carry of personal medications across state lines is subject to prescription rules; keep medications in original labeled containers.

Safety stakes: standard guidance.

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