Stack racks are a portable stacking frame that allows you to ship them or move them at will. They also come with a pallet and a stacking frame, often called tier rack. Jarke, Tier, and others are available.
Why stack rack? They are portable. They can be used for high density storage. They can be used to fill up low traffic aisles for temporary storage. They keep product from being crushed when stacking many levels tall.
