Paper sacks are made from paper or paperboard. The bottom and sides of the sack are usually reinforced with thin cardboard. A paper sack is a bag made of paper, usually with an opening on one side. Paper sacks are used to hold dry, flowable products such as flour, sugar, sand, cement, and lime. They are also used for packaging foodstuffs such as nuts, coffee, and rice. Paper sacks were first introduced in the early nineteenth century. They were originally made of brown paper and were stitched together with string. The paper sack was an improvement over the cloth bag, which was often used to hold flour and other dry goods. The paper sack was stronger and held more than the cloth bag. The paper sack soon became the standard packaging for dry goods. In the early twentieth century, paper sacks were made with a machine that could print the name of the product on the sack. This made it easier for the customer to identify the contents of the sack. Today, paper sacks are still used to package many dry goods. They are also used to package foodstuffs, such as nuts, coffee, and rice.