What is the name of the life raft that Callahan lives in for seventy-six days while lost at sea in the nonfiction book, Adrift: Seventy-Six Days Lost at Sea?

The Rubber Ducky III is the life raft that he lives in for seventy-six days while lost at sea. Though built for six people, it lacks room enough for Callahan to stand or stretch out. It is covered with a low tent canopy.