The Complete Guide to Amazon FBA Labeling Requirements (2026)

<p>Labeling is the 1 reason Amazon rejects FBA shipments. Heres every label requirement you need to know for 2026.</p><h2>FNSKU Labels</h2><p>Every unit sold on Amazon needs an FNSKU barcode. Not a UPC. Not an ASIN. FNSKU. Generated in Seller Central for each variation of your product.</p><ul><li>Must be scannable (minimum 1x1.5 inches)</li><li>Use thermal printer or laser inkjet smudges</li><li>Cover or remove any existing barcodes on the product</li></ul><h2>Poly Bag Warning Labels</h2><p>If your product ships in a poly bag, you need:</p><ul><li><strong>Suffocation warning</strong> required on all bags used for toys, bedding, or childrens products</li><li><strong>Bag thickness</strong> minimum 1.5 mil (new for 2026)</li><li><strong>Barcode visible</strong> FNSKU must be scannable through the bag or applied on top</li></ul><h2>Bundle Labels</h2><p>Bundles have special requirements:</p><ul><li>One FNSKU for the entire bundle (not each item)</li><li>Sold as Set sticker on the outer packaging</li><li>Box must list all included items</li></ul><p>Miss any of these and your shipment gets flagged. <a href="/services">Let SNS Prep Center handle your labeling</a> and sleep easy.</p>