Managing a string of pack animals — multiple pack horses or mules connected in a line and led by the lead rider — is one of the most demanding practical skills in packing, requiring constant awareness of every animal in the string, the terrain ahead and behind, and the load condition of each animal throughout the trip.
The string is typically organized with the calmest, most experienced animals near the front and closer to the lead rider, with animals that are newer or more reactive placed toward the middle where the behavior of animals ahead and behind provides some stabilizing social pressure. Each animal is tied to the tail of the one in front using a specific length of lead that prevents crowding while maintaining connection.
On trail, the lead rider must monitor the condition of the string continuously — watching for animals that are beginning to struggle with the terrain or their load, watching for lead ropes that are becoming entangled, and anticipating narrow sections and obstacle crossings that may require stopping to reorganize before proceeding. When an animal goes down or a load shifts badly, the entire string must be stopped immediately and the problem resolved before continuing.