I know this is a list of the Top 10 Multi Purpose Survival Tools but this is really worth mentioning. Your own brain is the most valuable multi purpose survival tool that you have. Your mind contains the willpower to persevere in a dire survival scenario, and as importantly, the ability to improvise and modify your Bug Out Plan to overcome unforeseen problems. Rely on your own thinking before any of these other tools we mentioned, it will get you out of most sticky situation.
The increased inflation rate in the 1960s, the US monetary devaluation, the continued concern over a possible nuclear exchange between the US and the Soviet Union, and perceived increasing vulnerability of urban centers to supply shortages and other systems failures caused a number of primarily conservative and libertarian thinkers to promote individual preparations. Harry Browne began offering seminars on how to survive a monetary collapse in 1967, with Don Stephens (an architect) providing input on how to build and equip a remote survival retreat. He gave a copy of his original Retreater's Bibliography to each seminar participant.