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A bag containing things that would allow one to evacuate and survive in an emergency or disaster situation, often for a minimum of 72 hours. Typical contents include food and water, a first-aid kit, extra clothing, necessary medication, and maps. To "bug out" is a slang term meaning to leave in a hurry. Sometime abbreviated to "BOB." When the hurricane hit, I was very glad that my parents always made us keep a bug-out bag at the ready.
See also: bag