Material Transfer & Storage Material MasterThe low headroom Material Master™ Bulk Bag Discharging System from Material Transfer & Storage features the Seal-Master™ bag spout chamber with “gull-wing” doors for quick and easy discharge spout access. The unit features the Sure-Seal™ discharge spout sealing system that allows dust-tight material discharge and the Flo-Master™ bulk bag massaging system to promote positive material flow into downstream process.