Paper sacks are made from paperboard, which is a type of cardboard. Paperboard is made from wood pulp, and is generally thicker and more rigid than paper. Paper sacks are used for a variety of purposes, including packaging food, chemicals, and other materials. They are also used for storage and as shipping containers. Paper sacks are manufactured in a variety of sizes and shapes. The most common type is the square- bottomed sack, which is typically used for packing dry goods such as flour and sugar. Round-bottomed sacks are also common, and are often used for packing liquids or other materials that might leak. Paper sacks can be printed with a variety of designs and logos. They can also be made from recycled paper.