Made of 600D polyester, the water-proof Protection Racket M2818-00 Marching Bass Drum Case is an extra-safe pick for a28 x 18-inch marching bass drum. This semi-rigid case features heavy-duty zips and a moisture-absorbent, propile fleece interior that’s been furnished with impact-resistant Propadd P2 foam. As a result, the case even stands up straight when it’s empty, making it exceptionally easy to pop in your marching bass.