sacks

Sacks is the plural of sack, a bag used for storage and transport. Sacks are typically made from coarse fabrics such as burlap or jute, but they may also be woven from canvas, plastic, or other materials. They come in a range of sizes and are widely used in agriculture, retail, and logistics—for example gunny sacks for grain or flour sacks for packaging.

In biology and medicine, a sac is a closed membranous cavity that contains air or fluid. Examples include the amniotic sac surrounding a developing fetus and various synovial or bursae sacs around joints. The term is used broadly to describe any bag-like, fluid- or air-filled structure within the body.

Notable people with the surname Sacks include Oliver Sacks (1933–2015), a neurologist and writer known for works such as The Man Who Mistook His Wife for a Hat, and David Sacks (born 1968), a technology entrepreneur and investor.

The word also appears in phrases and historical usages, such as the verb sack meaning to plunder or dismiss from employment, which is etymologically separate from its use as a noun describing a bag or anatomical structure. Overall, Sacks can refer to everyday containers as well as specialized terms in biology and notable individuals sharing the surname.