The strength of our Extensible Sack Kraft paper allows you to reduce the amount of packaging required and together with our flexible production processes you can get almost any combination of extensibility, strength and porosity. With just the right balance of strength and porosity, Sack from PURA Paper is ideal for valve sacks for commodities such as cement and other powdered materials. Our Sack is also suitable for PE coating when the contents, climate or other conditions require an additional moisture barrier.