JBL Rolling Sub Transporter Bag for VRX918S Speaker - Black (VRX918S-STR) The perfect transport solution for the VRX918S subwoofer. Cover constructed of 1200D Nylon with waterproof backing. 10mm padding and a soft Tricot fabric interior provide complete protection. Features a "speaker shield" - a rigid polyethylene sheet sewn into the front panel which protects the grille and speaker. Exterior lifting handles allow for superior mobility and functionality.