Mule reservations cannot be transferred: Only campground or Lodge reservations are eligible for the special exception to the standard rule of no changes, transfers or refunds. Pack mule reservations are not transferable.
However, you can do an informal pack mule share for bag spots, since each pack mule can carry up to 4 bags (see specifications listed in your account). This is most often done if someone has a pack mule reservation, but does not need all 4 bag spots, or someone would consider using gear transport but does not want to pay for a "full" pack mule.
Pack mule reservations affected by COVID-19 reservation transfers will be transferred with their associated campground or lodge reservation as a special exception.