Outoor cooking differs substantially from kitchen-based cooking, the most obvious difference being lack of an easily defined kitchen area. As a result, campers and backpackers have developed a significant body of techniques and specialized equipment for preparing food in outdoors environments. Such techniques have traditionally been associated with nomadic cultures such as the Berbers of North Africa and the Plains Indians and pioneers of North America, and have been carried down to and refined in modern times for use during recreational outdoors pursuits.