Eventually everything will be gone if you wait long enough, but if you look at actual events such as a major hurricane here in the USA, the Greece financial meltdown, the collapse of USSR, the war in Syria, the situation in Venezuela, or any poor country that has been hit by a major disaster you’ll quickly see a pattern of items that disappear at the very beginning of a panic buying rush.
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Every survival kit and emergency preparedness plan should include emergency blankets and lights. Mylar blankets effectively reflect body heat, and can keep you warm throughout a cold night. Their extreme lightweight and compact size make them an ideal part of a survival kit. To ensure you have adequate light in the event of a power failure, chemical snap lights are a convenient solution that doesn’t rely on batteries. Many snap lights last for 12 hours or more, and have a five year shelf life, so you know they’ll be there for you when you need them.