Survival gear is important for everyone to have because natural disasters can happen anywhere. And, in cities there are still risks of civil unrest, widespread destruction from earthquakes and storms, and increases in the risk of contagious diseases or pollutant contaminations. Being able to leave quickly or shelter in place with the things you need to survive is often more important in a city because the natural world is less likely to provide the things you need (like food you can harvest or hunt, fresh water you can collect, and so on).