Military MREs. I don't find them particularly tasty, but they are popular among preppers. A bit on the heavy side (usually around 1,100 kcal per pound). Portable warm food with a ton of different menus available - although for the best price, you usually need to buy a variety box and can't cherry-pick. Moderately expensive (~150 kcal per dollar). Shelf life around 5-7 years, depending on the manufacturer and on storage conditions. A good source is TheEpicenter.com.
When it comes to recommendations, there is no short list of hobbies that are objectively better than the rest; the selection is vast, and the right choice will inevitably depend on your own interests, natural talents, the space you have available, and on countless other constraints. That said, here are some fairly popular options that may be worth thinking about:
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If you have a spouse, walk them through your plans and make sure they can access the essential supplies and know how to use them in your absence. If you have children, give them the very basics as well. For example, in case of a fire, they should know the safest way out without having to wait for you; tell them how to react to home intrusions and medical emergencies, too.
For folks interested in getting a nice, compact Geiger counter, Radex One ($120) is pretty hard to beat; it is tiny, inexpensive, and can be hooked up to a PC to continuously monitor the environment (and send e-mail or SMS alerts). The one caveat is that similarly to many other low-cost units, this device maxes out at 1 mSv/h - enough to know that something is very wrong, but not enough to tell if you're going to receive a life-threatening dose in an hour or somewhere within the next six months. In other words, some of the more hardcore preppers may want to invest in a more capable unit, such as ADM-300 (which goes all the way to 100 Sv/h) or RAD-60R (3 Sv/h). Decommissioned military and civilian devices in excellent working condition can be found on eBay for around $200.
Subscription services. Small monthly fees add up to gargantuan sums over the years. Do you really need cable TV, or can you watch most of the same shows online for less? Are you still paying for a landline or for that AOL account? How often are you using that gym membership? Can you try out lower speed for your Internet service? Or slightly increase the deductible on your car?
Regardless of where you live or your family situation, become a community with others. Even if your community consists of only two or three persons, these few people will serve as your support group and sounding board for the tactical decisions you will make when things get tough. In addition, you need at least one other person to watch your back as you will watch theirs.
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.
Flashlights. Unless you are living in a rural area, you don't need an eye-searing torch that chews through ten boxes of batteries in a day. Get two small, high-quality AA flashlights that give you at least 20 hours on low power; keep one near your bed, and another in your car or in an emergency stash. For a low-cost option, try Fenix E12 ($25). If you want 100+ hours of battery life and don't mind the price tag, check out Fenix LD22 ($55).
TREE SACKS ARE LIGHT WEIGHT, EASILY PACKED, AND PROVIDE COMFORT WHEREVER YOU ARE! The Tree Sack is just 15.75 oz. with lots of room for a single at 9ft long by 4½ ft wide. The Tree Sack Double is just 25 oz. and has all the space you need being 10ft long by 6½ ft wide. The Tree Sack holding bag allows you to stuff the entire hammock, straps, and carabiner into one small unit. This makes carrying or packing the Tree Sack in your backpack a breeze!