1) In desert areas, the survival kits are shade hats, much water, matches, sun glasses,medical equipment, a whistle. 2) In tropical areas, a survival kit may have mosquito head netting, anti-malaria tablets,a candle, a fishing kits,antiseptic creams, salt tablets, medical equipments, a wire saw, a compass. 3) In alpine areas, survival kits may have winter clothing, sleeping bags, sun glasses and snow goggles, snow shoes, extra socks, a wire saw,a whistle, a compass, medical equipments.
You definately need to design your BOB or survival kit to be compatible with your environment be it out in the elements or in the city or countryside.