This one is pretty obvious, but it stands repeating. When building a stockpile, you want to stick to items that will be able to last on your shelf. Items like canned vegetables, canned fruit, jars of peanut butter, jerky, and beans are excellent choices for a stockpile, in addition to household items like toothpaste, soap, conditioner, paper towels, and toilet paper.
In addition, the kits may contain typical individual "survival kit" items, such as nylon tarps, extra clothes and coats, blankets, sleeping bags, matches or other fire starting equipment, a compass and maps, flashlights, toilet paper, soap, a pocket knife and bowie knife, a fishing kit, a portable camping stove, a power inverter, backpack, paper and pencil, a signaling mirror, whistle, cable saw, bleach, insect repellent, magnifying glass, rope and nylon cord, pulleys, and a pistol and ammunition.
Pepper spray. An excellent, temporarily incapacitating weapon - very difficult to resist and capable of buying you just enough time to escape. Works quickly and reliably at distances up to perhaps 10 feet; can also stop some animal attacks. Usually not heavily regulated, making it easy to obtain and carry even in places that frown upon other forms of armed self-defense (but check the laws). Pepper spray becomes less effective in strong wind; there is also some risk of blowback, but this is mitigated in narrow-stream products, such as Sabre Pepper Gel ($18).
Precious Metals – Investigate this for yourself, but I find the arguments and historical track records against fiat currency and the current rumblings of Government wanting to take care of your investments for you very compelling. Gold is easier to transport with the high cost to weight, but you might have problems cashing a gold coin for a tank of gas. Silver is where I have chosen to invest in precious metals.
Firearms. A very effective and supremely intimidating weapon, with lethality ranging from 20% for handguns to 80% for shotguns; for a novice user, the effective range is somewhere between 10 and 100 yards. Guns are heavily regulated in much of the world, but widely available in the US - although there are several states or municipalities that make it very difficult to get a permit unless you are a celebrity or a prominent donor.
Survival kits, in a variety of sizes, contain supplies and tools to provide a survivor with basic shelter against the elements, help him or her to keep warm, meet basic health and first aid needs, provide food and water, signal to rescuers, and assist in finding the way back to help. Supplies in a survival kit normally contain a knife (often a Swiss army knife or a multi-tool), matches, tinder, first aid kit, bandana, fish hooks, sewing kit, and a flashlight.