Auto dubbed and translated, but very much worth a watch.
The author, Eugenio Monesma, writes -
In some Pyrenean villages, pack animals were still used for transport along the narrow, winding mountain paths. To secure the load properly, a harness was needed to fasten it against the animal's body without damaging its hide: the cinch or pack saddle. In 1997, José made me a pack saddle for pack animals in San Juan de Plan (Huesca).