Add efficiency to heavy-duty picking, assembly and sorting applications with Heavy Duty Hoppers. Get high density storage and quick access to your product with Plextonå¨ Hoppers. These hopper-front containers provide all the strength and tough characteristics of Plexton Stack-N-Nest containers with the added ability to pick and visually inspect the contents. Stack-N-Nest Hopper Bins are manufactured in high-density polyethylene and ideal for picking and transportation of materials.