High Quality Content by WIKIPEDIA articles! A pack saddle is any device designed to be secured on the back of a horse, mule, or other draft animal so it can carry heavy loads such as luggage, firewood, small cannons or other weapons too heavy to be carried by humans, etc. Ideally the pack saddle rests on a saddle blanket or saddle pad to spread the weight of the saddle and its burden on the pack animal's back. The underside of the pack saddle is designed to conform well to the shape of the pack animal's back. It is typically divided into two symmetrical parts separated by a gap at the top to ensure that the weight being carried does not rest on the draft animal's backbone and to provide good ventilation to promote the evaporation of sweat.