Definition of "pack-mule" []

• A mule used to carry packs or burdens. (noun)

The Century Dictionary (Public Domain)

• "Airlines have stepped up efforts to police carry-on limits, patrolling airport lobbies to intercept pack-mule passengers and force them to check bags that violate limits before they get through security."
• "She had healed up enough to go on a pack-mule trip with friends up into the mountains last weekend."
• "The loss to the Comanches, who were hunkering down into their winter camps, was stunning: sixty-nine pack-mule loads of buffalo meat—something more than fifteen thousand pounds of it—and three hundred seventy horses.14"