The employers stressed the importance of the pouch. They often said that, if it came to be, the horse and rider should perish before the mochila did. The mochila was thrown over the saddle and held in place by the weight of the rider sitting on it. Each corner had a cantina, or pocket. Bundles of mail were placed in these cantinas, which were padlocked for safety. The mochila could hold 20 pounds (9 kg) of mail along with the 20 pounds (9 kg) of material carried on the horse. Eventually, everything except one revolver and a water sack was removed, allowing for a total of 165 pounds (75 kg) on the horse’s back. Riders, who could not weigh over 125 pounds (57 kg), changed about every 75–100 miles (120–160 km), and rode day and night. In emergencies, a given rider might ride two stages back to back, over 20 hours on a quickly moving horse.