Unload-While-Run High-Capacity Stacker Maximize your productivity with the new Canon High-Capacity Stacker. This holds up to 6,000 precisely stacked sheets, and with unload-while-run, your stacking capabilities are virtually limitless. Adding a high-capacity stacker to your engine configuration provides dependable, unattended printing for longer runs. The High-Capacity Stacker-G1 has virtually unlimited stacking capability.