Koch Filter 102 041 011 Multi Pleat XL8 1" Semi Standard Size 18" x25" x1" P Mask Two large pouches hold additional Two large pouches hold additional gear and you can carry the bag with two Nylon handles as well as a padded Nylon back pack straps dual cylinder design virtually eliminates the possibility of bent rods moisture resistant paperboard (24 point) double wall construction with an integral die cut faceguard on the air entering and air leaving sides to prevent movement and protect the media pack and ensure media pack integrity during shipping and actual Standard Capacity XL8 filters are an excellent choice in applications where filter change schedules are based on preventive maintenance schedules