JBL Rolling Sub Transporter Bag for JBL 18-Inch Sub Speaker - Black (JBL-SUB-18T) The perfect solution for transporting your new EON18 Sub Offers superior protection and easy transportation with heavy-duty construction and a built-in caster board Integrated caster board lets you roll in and out of gigs quickly & efficiently - makes set up & tear-down easier than ever Bag constructed of nylon with water-resistant backing, thick protective padding and soft tricot interior Durable "double access" #10 nylon coil zippers