The pinch bottom paper bag is constructed by folding and sealing the bottom of the bag using a pinch or fold technique, which creates a flat and stable base. This design provides the bag with enhanced structural integrity and stability, allowing it to stand upright on its own. It offers several advantages over traditional open-mouth paper bags, such as better resistance to tipping over and improved visibility of the contents.

The process of making pinch bottom paper bags involves feeding a continuous sheet of paper through a machine, which folds and seals the bottom of the bag.