kits as survival technology advances. Some examples of these tools are high-power flashlights, rapid use saws, signal devices such as mini signal mirrors, and water purification methods. Emergency kit An emergency kit, disaster bag, bug-out bag (BOB), also known as a 72-hour kit, GOOD bag (get out of Dodge), personal emergency relocation kit (PERK), go-bag, survival backpack, or quick run bag (QRB) is a portable kit containing items that would help a person to survive for 72 hours during an escape or evacuation from an emergency event or disaster such as a hurricane, earthquake, or flood. The focus is on evacuation rather than long-term survival. The kits are also popular in the survivalism subculture. Outline The term "bug-out bag" is related to, and possibly derived from, the "bail-out bag" emergency kit many military aviators carry. In the United States, the term refers to the Korean War practice of the U.S. Army designating alternative defensive positions, in the event that the units had to retreat. They were directed to "bug out" when being overrun was imminent. The term has since been adopted by military training institutions around the world, with standard operating procedures involving a bug-out location, a method of withdrawal, and the bare supplies needed to withdraw quickly but still survive in the field. The concept passed into wide usage among other military and law enforcement personnel, though the "bail-out bag" is as likely to include emergency gear for going into an emergency situation as for escaping an emergency. The primary purpose of a bug-out bag is to allow one to evacuate quickly if a disaster should strike. It is therefore prudent to gather into a single place all of the materials and supplies that might be required to do this, such as a bag or a few storage containers. The recommendation that a bug-out bag contain enough supplies for 72 hours arises from advice from organizations responsible for disaster relief and management that it may take them up to 72 hours to reach people affected by a disaster and offer help. The bag's contents may vary according to the region of the user, as someone evacuating from the path of a hurricane may have different supplies from someone who lives in an area prone to blizzards, earthquakes, or wildfires. In addition to allowing one to survive a disaster evacuation, a bug-out bag may also be used when sheltering in