Smoke Elser and Bill Brown's "Packin' In on Mules and Horses" Book shows how your trip will be easier and more enjoyable by knowing more about the animals used and why and how they carry their loads as they do. Whether you’re an expert or a dude, Smoke’s packing system will get you into and out of the back country safely and efficiently. Best of all, you will start to become self-sufficient and resourceful, important aspects of any wilderness travel.