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loose-pack sack Canvas http://www.answers.com/topic/sack of untied but http://www.answers.com/topic/faced-mail ready for delivery to the U.S. Postal Service."loose-pack sack." Dictionary of Marketing Terms. Barron's Educational Series, Inc, 2000. Answers.com 08 Aug. 2007. http://www.answers.com/topic/loose-pack-sack
a gunny sack is a sack made of gunny or burlap
Scrotum
A sack on your body typically refers to a pouch-like structure or a loose skin area, often associated with certain body parts. For example, the scrotum is sometimes colloquially called a "sack" as it houses and protects the testicles in males. In a more general sense, it can also refer to skin folds or areas of excess skin that resemble a sack-like appearance.
The sack worn by mountain men around their necks was called "a bullet pouch."
amniotic sack
The pink sack is called the placenta.
possibles sack
Udder
Sac
Isn't it a ballsack? No, it's a bindlestiff (bindle for the sack, stiff for the stick that holds it.)
A sack