Pack Horse

A packhorse, pack horse, or sumpter is a horse, mule, donkey, or pony used to carry goods on its back, usually in sidebags or panniers. Typically packhorses are used to cross difficult terrain, where the absence of roads prevents the use of wheeled vehicles. Use of packhorses dates back to the Neolithic period. Today, westernized nations primarily use packhorses for recreational pursuits, but they... (Wikipedia)