Fastpacking

Fastpacking is a combination of trail running and ultralight backpacking. It is described by writer Clint Cherepa as "hiking the ups, jogging the flats, and running the downs", depending on the gradient, because of the weight carried. Participants carry a light pack with essential supplies, including a sleeping bag and tent, or similar form of shelter, if mountain huts or other accommodation is not available. The weight carried will vary but fastpackers aim at no more than 15 pounds (6.8 kg) and some achieve less than 10 pounds (4.5 kg). This activity may be undertaken either unsupported, self-supported, or supported. "Unsupported fastpackers make no use of outside assistance along the route", while self-supported fastpackers will leave caches of supplies along the intended route.

Fastpacking involves covering a considerable distance over several days with a pack, which requires both mental and physical strength. Established, well-traveled long distance trails are used because "with minimal extra food and clothing, getting stuck in the backcountry for an extended period of time can quickly become a dangerous proposition".