Saddle Sandbags manufactured only at The SandbagStore.com: www.sandbagstore.com/saddle-s... are built to last a lifetime. Constructed of water-resistant 1000D black Cordura nylon fabric with urethane coating on inside of bag. Two heavy plastic liner bags are filled with sanitized sand, impulse sealed, and placed into the saddle sandbag pockets which are then sewn shut with industrial nylon thread. These liners help keep dust in and water out. Double stitched box and cross patterns attach the 1" wide black heavy duty web handle.