Stackable cages offer clear benefits: fixed capacity, neat piles, visible contents for fast stocktaking, and better warehouse space use. They are tough, easy to transport, and reusable — fitting factory floors, supermarket display and storage, and outdoor placement. Improved cages sit directly on racks or beside production lines and can still be stacked. Wheeled cages roll around the workshop for turnover; cages lined with PVC or steel plate stop small parts falling through the mesh. Commonly used stackable cages come in three types. First, wheeled cages — mainly for in-workshop turnover, easy to push but not stackable. Second, footed cages — stackable and rackable, suiting three-dimensional warehouses and racks. Third, wheeled-plus-footed — dual use: push them for turnover, then step the feet down to stack when parked. Select by your main duty; there is no need to cover every case at once.