The Matthews 25 lb Empty Cordura Sandbag (Orange) is used whenever you need extra weight to prevent tipping. You usually "bag" stands, especially when the weight is off center, such as with a heavy Scrim. It helps to stabilize the equipment in windy situations and can counter balance Boom Arm applications. Matthews fills the Sandbag with sanitized sand to prevent algae growth if they get damp. The empty bag is completely sewn except for a 1" seam, left open for the user to fill and then sew closed.