Trail mix is a combination of dried fruit

Fruit

In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...

, grain

GRAIN

GRAIN is a small international non-profit organisation that works to support small farmers and social movements in their struggles for community-controlled and biodiversity-based food systems. Our support takes the form of independent research and analysis, networking at local, regional and...

s, nuts

Nut (fruit)

A nut is a hard-shelled fruit of some plants having an indehiscent seed. While a wide variety of dried seeds and fruits are called nuts in English, only a certain number of them are considered by biologists to be true nuts...

, and sometimes chocolate

Chocolate

Chocolate is a raw or processed food produced from the seed of the tropical Theobroma cacao tree. Cacao has been cultivated for at least three millennia in Mexico, Central and South America. Its earliest documented use is around 1100 BC...

, developed as a snack

Snack

A snack is a small portion of food eaten between meals. The food might be snack food—items like potato chips or baby carrots—but could also simply be a smaller amount of any food item.-Snacks and health:...

 food to be taken along on outdoor hikes.

Trail mix is considered an ideal snack food for hikes, because it is tasty, lightweight, easy to store, and nutritious, providing a quick boost from the carbohydrates in the dried fruit and/or granola, and sustained energy from the mono- and polyunsaturated fats in nuts.

Both Hadley Fruit Orchards and Harmony Foods (two California growers) claim that trail mix was first invented in 1968 by two California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 surfers who blended peanuts and raisins together for an energy snack.