The communications equipment may include a multi-band receiver/scanner, a citizens band (CB) radio, portable "walkie-talkies" with rechargeable batteries, and a portable battery-powered television. The power supplies may include a diesel or gasoline generator with a one-month fuel supply, an auto battery and charger, extension cord, flashlights, rechargeable batteries (with recharger), an electric multi meter, and a test light. Defense items include a revolver, semi-automatic pistol, rifle, shotgun, ammunition, mace or pepper spray, and a large knife such as a KA-BAR or a bowie knife.
In tropical areas, a survival kit may have mosquito head netting, additional insect repellent, anti-fungal cream, a machete, water purification tablets, foot powder, matches, a flint strike, a compass, a wire saw, a space blanket, medical equipment (gauze pads, elastic gauze bandage, antiseptic creams, anti-malaria tablets, anti-infection tablets, bandages, etc.), salt tablets, a fishing kit, snare wire, extra socks, a candle, a signal mirror, flares, a sewing kit, safety pins, tinder, tape, a whistle, and rations.
In the next decade Howard Ruff warned about socio-economic collapse in his 1974 book Famine and Survival in America. Ruff's book was published during a period of rampant inflation in the wake of the 1973 oil crisis. Most of the elements of survivalism can be found there, including advice on food storage. The book championed the claim that precious metals, such as gold and silver, have an intrinsic worth that makes them more usable in the event of a socioeconomic collapse than fiat currency. Ruff later published milder variations of the same themes, such as How to Prosper During the Coming Bad Years, a best-seller in 1979.
This group stresses being able to stay alive for indefinite periods in life-threatening wilderness scenarios, including plane crashes, shipwrecks, and being lost in the woods. Concerns are: thirst, hunger, climate, terrain, health, stress, and fear. The rule of 3 is often emphasized as common practice for wilderness survival. The rule states that a human can survive: 3 minutes without air, 3 hours without shelter, 3 days without water, 3 weeks without food. 
Lifeboat survival kits are stowed in inflatable or rigid lifeboats or life rafts; the contents of these kits are mandated by coast guard or maritime regulations. These kits provide basic survival tools and supplies to enable passengers to survive until they are rescued. In addition to relying on lifeboat survival kits, many mariners will assemble a "ditch bag" or "abandon ship bag" containing additional survival supplies. Lifeboat survival kit items typically include:
Cigarettes will also be hugely useful for starting fires and saving coals (as any fan of post-apocalyptic literature knows, this is of great importance). The filters can be used to clean water, although you'll need the patience of Stephen Baldwin to pull it off. If you do manage to live for longer than a few weeks without plumbing and Internet, you'll be able to protect your budding prepper garden by soaking cigarette butts in water and spraying the resulting chemical-laden tobacco juice on your produce. This is a technique already in use by people too impatient to wait for the apocalypse, though it is ironic and entertaining that they consider using cigarette-butt sludge a "natural" way to ward off pests.
Monetary disaster investors believe the Federal Reserve system is fundamentally flawed. Newsletters suggest hard assets of gold and silver bullion, coins, and other precious-metal-oriented investments such as mining shares. Survivalists prepare for paper money to become worthless through hyperinflation. As of late 2009 this is a popular scenario. Many will stockpile bullion in preparation for a market crash that would destroy the value of global currencies.
This group has a primary concern with maintaining some form of legal system and social cohesion after a breakdown in the technical infrastructure of society. They are interested in works like The Postman by David Brin, Lewis Dartnell's The Knowledge: How to Rebuild Our World from Scratch, or Marcus B. Hatfield's The American Common Law: The Customary Law of the American Nation.
The LifeStraw filter meets EPA standards and has been shown to remove more than 99.9% of waterborne parasites and bacteria. Humanitarian relief workers in all corners of the globe use the LifeStraw to help bring safe water to threatened communities and refugee camps. The “straw” itself weighs a scant 0.1 pounds and measures 9” in length and 1” in diameter. Few things are worse than being lost and being besieged by waterborne illness. Bring this essential piece of survival gear with you whenever you venture into the wild and make sure water problems are not on the menu.