When talking about a "sac," we are usually referring to a pouch, bag, or container used for storing or carrying something. However, there are several other words that can be used synonymously with "sac" depending on the context. For example, a pouch can also be referred to as a satchel or backpack. A bag can be referred to as a tote, duffel, or messenger bag. In anatomy, a "sac" can refer to a cyst or bladder, while in botany it can refer to a plant structure that contains seeds or pollen. Knowing these synonyms can help diversify our vocabulary and better describe the objects or concepts we are referring to.