How do I avoid barcode and size label errors in underwear orders?

Short answer: Barcode and size errors usually come from one of three places: wrong master data, wrong artwork, or wrong application at packing. GS1 guidance is that every size and colour combination needs its own GTIN, so the first step is a single master list that links style, colour, size and GTIN. Errors creep in when this list is copied by hand into artwork, when label rolls for different sizes are stored together, or when packers apply labels without scanning. Prevent them with one controlled master list, artwork generated from it and checked by scanning, label rolls separated and marked by size, scanning at packing, and a final scan check during inspection.

Where errors happen

• Master data: GTIN assigned to the wrong size or colour.
• Artwork: barcode copied incorrectly or wrong file used.
• Printing: label rolls for different sizes mixed.
• Packing: wrong label applied to the wrong pack.
• Reorders: old artwork reused after a change.

Master data

• Keep one list of style, colour, size and GTIN.
• Lock the list once approved and change it only through a controlled process.
• Share the same file with the factory, label printer and warehouse.

Artwork and printing

• Generate barcodes from the master list, not by retyping numbers.
• Scan proofs and printed samples to check the number and readability.
• Print size clearly next to the barcode.

Packing

• Store label rolls in separate, marked bins per size and colour.
• Pack one size and colour at a time.
• Scan the first piece of each run and a sample during packing.

Marketplace labels

If you sell through Amazon FBA, its prep guide requires a scannable barcode on each unit, readable without opening the packaging. Cover other scannable codes that could be read by mistake.

Inspection

• Scan sampled units and compare with the size on the garment label.
• Check carton labels against packing lists.

A worked example

For the rejected delivery, check the master list first. If medium and large GTINs were swapped there, every label printed from it is wrong; if the list is correct, look at label storage and packing. Fix the source, then relabel affected stock after checking every unit.

Reorders and changes

Many errors appear on reorders, when old artwork or old label stock is used after a size or colour change. Withdraw superseded files and label stock, and check label rolls against the current master list before each run.

Limits

Process controls reduce errors but cannot remove them. Inspection scanning remains necessary.

Facts, recommendations and uncertainty

Established: each size and colour needs its own GTIN, and errors come from data, artwork or packing. Recommendation: use one controlled master list, scan at artwork, packing and inspection. Uncertain: retailer penalties, which differ.

Sources and further reading

• GS1 — How many GTINs for a product with many sizes and colours
• Amazon — Packaging and Shipping Inventory to Amazon (FBA prep guide)

Standards and regulations are referenced by their published scope. Test parameters, cycles and pass levels should be agreed with your laboratory for the specific product; legal requirements should be confirmed for each destination market.