For transportation, we generally pack our specie in sacks made of raw beef hide, which shrinks upon drying, and thus presses the contents so closely as to prevent friction. A pair of these packages, usually containing between one and two thousand dollars each, constitutes an ordinary mule-load on the mountain routes.
Commerce of the Prairies (1831–1839), Chapter 22 - Visit to Town of Jesus-Maria — Anti-Masonic Auto de Fe