Method 1

One option is is to assign different GTIN-13s at every packaging level. 

Image of GTIN-13 packaging levels

Remember, when capturing a GTIN-13 in a GS1-128 or ITF-14 barcode, you’ll need to include a leading zero as GTIN is a 14-digit field in these barcodes. 

For data or barcode fields that require a 14-digit format, leading zeros need to be added.
GTIN-8 0 0 0 0 0 0 N N N N N N N N
GTIN-12 0 0 N N N N N N N N N N N N
GTIN-13 0 N N N N N N N N N N N N N
GTIN-14 N N N N N N N N N N N N N N
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If the product is to be supplied into retail, a GTIN-13 must be assigned to the retail pack and captured in an EAN-13 barcode. 

Method 2

Alternatively, you can create GTIN-14s .

Start by assigning a GTIN-13 for the each or consumer unit, then allocate GTIN-14s created from that GTIN-13 to each additional packaging level.

In the illustration below GTIN A would be the GTIN-13, and GTINs B, C and X would be allocated GTIN-14s:

Using this method would mean that an organisation would not go through their allocation of GTIN-13s as quickly. 

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As a GS1 UK member, you are able to access all your GTINs in the Numberbank. It is quick and easy to allocate GTIN-13s and GTIN-14s to your products and your cases whenever you need them.

The article below shows you the two different methods to identify different packaging levels in My Numberbank.

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Common mistake

Some organisations are under the impression that in order to meet regulatory requirements they have to use GTIN-14s to identify their different packaging levels. This is incorrect – the method chosen is completely up to the GTIN allocator.