Great question! Kanban bins can be any size and used for any type of business. I have seen Kanban bins used at the hospitals, IT offices, coffee shops, pharmacies, auto mechanics, and of course manufacturing facilities. Many businesses use these bins to hold and manage their inventory. Depending on how advanced the company processes and computer systems are, they may even have barcodes so when the inventory reaches a minimum qty the employee will scan the barcode which triggers a PO to be created for purchasing. Kanban is a great tool to control inventory and cost. Hope this helps.