In fact, besides small sacks of sterilized water there wasn't much else that could be done. (havebabywilltravel.com)
The anal glands are two small sacks just inside your pets» anus, and are filled with a foul smelling «scent fingerprint» that animals use to identify each other in the wild. (professorshouse.com)
Over the tendon is a bursa (small sack of fluid used to help lubricate the moving tendon). (sportsinjuryclinic.net)