The waterproof document bags are ideal to store things which are sensitive to water such as : Orders, maps, travel documents writing paper etc. They consist of the same flexible, non cracking, tear proof material as the ortlieb map case. A special manufacturing guarantees seam welds, as strong as the plastic itself. Opening and closing is simple too : Just roll the fastener and close the Velcro, making it 100% waterproof. Size : A3