Outdoor cooking is the preparation of food in the outdoors. A significant body of techniques and specialized equipment exists for it, traditionally associated with nomadic cultures such as the Berbers
Outdoor cooking with a large pot and other utensils
A gas cartridge portable stove
Australian "snags" (English style sausages) cooking on a campfire
Heat convection in a hobo stove (schematic)
Ultralight backpacking is a style of lightweight backpacking that emphasizes carrying the lightest and least amount of gear. While no technical standards exist, some hikers consider "ultralight" to me
A bivouac (using a bivy sack) in winter at Benediktenwand, Germany
Many ultralight backpackers use a non-freestanding system where the trekking pole serves as the structure for the tent.
A common variety of trail mix made out of peanuts, raisins, and candy coated chocolate, around 4.8 kcal/gram