1. Preformed, flexible container made usually of cloth, leather, paper, or plastic, and closed on all sides except one. The open side may be sealed or tied after filling in the contents. Small bags are also called pouches, and shipping bags made of jute or polypropylene are also called sacks.
2. Traditional unit of weight for Portland cement. The metric-bag weighs 50 kilograms (110.2 pounds), US-bag 94 pounds (42.6 kilograms), and Canadian-bag 87.5 pounds (39.7 kilograms).