How many UPC Codes I need ?

Basically, the retailer uses UPC codes to identify their product in the inventory system a different UPC barcode is required for each and every product. As for example, If you are selling two flavors of bottled water in

Small — 2 flavors, that means you need 2 UPC/EAN barcode

Medium — 2 flavors, that means you need 2 UPC/EAN barcode

Large — 2 flavors, that means you need 2 UPC/EAN barcode

So total no. of UPC Code you need is (2+2+2)=6 UPC barcodes for each all flavor of bottles to list of different sizes of the product. As each UPC/EAN Code can help to differentiate the product from one another.