Blup sack



A blup sack was part of an ecorbs' anatomy. It was red-colored and pulsated rhythmically when the owner was happy.

Behind the scenes
Blup sacks appeared in a story in Monsters and Aliens from George Lucas, a book published in 1993. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical.