Overview

Amazon is making a significant change to how FBA inventory is tracked and fulfilled. Starting July 31, 2026, commingling — the practice of mixing identical products from different sellers to speed up delivery — will officially end. This shift introduces new barcode labeling requirements that differ depending on whether you are a brand owner or a reseller, and every FBA seller needs to understand what action is required before the deadline.

Key Points / What Sellers Need to Know

• Commingling is ending — Amazon will no longer fulfill orders using another seller's identical inventory. Customers who purchase from you will only receive products sourced from your own stock, including for returns and removals.
• Brand owners keep using manufacturer barcodes — If you are enrolled in Brand Registry as the brand representative, you can continue shipping products with their existing manufacturer barcodes (UPC, ISBN, etc.) without applying additional stickers.
• Resellers must switch to FNSKU barcodes — All resellers, including authorized resellers of a brand, will be required to apply Amazon FNSKU barcode stickers (X00 labels) to every unit sent to fulfillment centers after July 31, 2026.
• Non-compliance has consequences — Inventory received from resellers without proper FNSKU labels after the deadline will be flagged as defective, and unlabeled units will not be eligible for reimbursement.
• Existing stickerless inventory is grandfathered — Products already in transit or stored at fulfillment centers before the deadline can continue selling under their original SKUs with no action required.

What Is Commingling and Why Is It Ending?

Commingling allowed Amazon to pull the nearest available unit of an identical product from any seller's inventory to fulfill an order, prioritizing delivery speed over inventory separation. Amazon has determined that most sellers now maintain sufficient inventory levels to keep products positioned close to customers, making commingling unnecessary for fast delivery. By ending the practice, Amazon ensures that every order is fulfilled exclusively from the purchasing seller's own stock. This change also means that returns and removals will always route back to the correct seller, reducing mix-ups and improving accountability across the fulfillment network.