Multi-wall paper valve bags to pack building materials, such as powders, granules, cement and more. Ideal for packing cement mixtures, aggregates, asphalt, ready-mixed concrete, adhesives, gypsum plasters, mortars, grouts, bitumen coatings, cementitious paints, tile fixes, epoxy coatings, bagged sand, geogrid products, landscaping products and more. Also known as valve sacks and multi-wall paper bags