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.

Pack selection

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.

Maintenance and readiness

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.

Bug-out bag readiness checklist

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.