Sack Craft paper, or just sack paper, is a porous craft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability. Pulp produced by the craft process is stronger than that made by other pulping processes; acidic sulfite processes degrade cellulose more, leading to weaker fibers, and mechanical pulping processes leave most of the lignin with the fibers, whereas kraft pulping removes most of the lignin present originally in the wood.
