The term "survival kit" may also refer to the larger, portable survival kits prepared by survivalists, called "bug-out bags" (BOBs), "Personal Emergency Relocation Kits" (PERKs) or "get out of Dodge" (GOOD) kits, which are packed into backpacks, or even duffel bags. These kits are designed specifically to be more easily carried by the individual in case alternate forms of transportation are unavailable or impossible to use.
Survivalists' concerns and preparations have changed over the years. During the 1970s, fears were economic collapse, hyperinflation, and famine. Preparations included food storage and survival retreats in the country which could be farmed. Some survivalists stockpiled precious metals and barterable goods (such as common-caliber ammunition) because they assumed that paper currency would become worthless. During the early 1980s, nuclear war became a common fear, and some survivalists constructed fallout shelters.
Some evangelical Christians hold to an interpretation of Bible prophecy known as the post-tribulation rapture, in which the world will have to go through a seven-year period of war and global dictatorship known as the "Great Tribulation". Jim McKeever helped popularize survival preparations among this branch of evangelical Christians with his 1978 book Christians Will Go Through the Tribulation, and How To Prepare For It.
There’s the compass. There’s the compass and map. And then there’s survival gear like this Garmin High Sensitivity GPS tool with its GLONASS receiver, 100K topographical maps, BirdsEye Satellite imagery subscription and triple axis compass. The screen is easily readable in the brightest sunlight or deepest night and the 8GB of memory mean you’ll always have the information you need now at your fingertips. If you’re serious about staying out of trouble when you venture into the unknown bring the Garmin High Sensitivity GPS tool with you and rest easy.
SOG made their shovel practical survival gear by cutting back its length to a manageable 18 ¼” and its weight to an equally manageable 24 ½ ounces. It folds up to a mere 1 foot long and can be easily strapped to the exterior of any decent sized backpack. The SOG shovel also boasts a row of thick rugged teeth along the side for hacking and cutting underbrush or harvesting wood for your fire. The blade can also be rotated and used as a pick or a hoe to do more precise clearing. All in all this is a piece of survival gear you won’t want to do without.
Astronauts are provided with survival kits due to the difficulty of predicting where a spacecraft will land on its return to earth, especially in the case of an equipment failure. In early US space flights, the kit was optimised for survival at sea; the one provided for John Glenn on the first American space flight in Friendship 7 contained "a life raft, pocket knife, signaling mirror, shark repellent, seawater desalting tablets, sunscreen, soap, first aid kit, and other items". A survival kit was provided for the Apollo program which was "...designed to provide a 48-hour postlanding (water or land) survival capability for three crewmen between 40 degrees North and South latitudes". It contained "a survival radio, a survival light assembly, desalter kits, a machete, sunglasses, water cans, sun lotion, a blanket, a pocket knife, netting and foam pads".
To me, the best option is to store emergency food. How much? If you have none, store enough for a few days. If you have enough for a few days, get enough for a week. How much you store depends on what time frame you think you're at risk for having to be completely independent. The early settlers of the southwest liked to store enough food for a whole year and still do to this day!