Amazon FBA Prep Requirements from China: The 2026 Compliance Checklist

Direct answer: Amazon FBA prep from China means getting five things right before goods leave the factory: a scannable FNSKU label on every unit, correct polybag suffocation warnings and sealing, compliant carton labelling with FBA shipment IDs, carton weight and dimension limits (normally 50 lb / 22.7 kg and 25 inches per side), and set labelling where multiple items ship as one unit. Supplier-performed prep is typically 60-80% cheaper than Amazon’s prep service — but only if you supply exact specifications and verify them by inspection.

Prep errors are the most avoidable cost in the FBA supply chain. Amazon charges per-unit fees to fix them, and mislabelled inventory can be refused at the seller’s expense. Worse, failures surface after the goods have crossed an ocean, when correcting them means paying a domestic prep centre to unpack and relabel an entire shipment.

Table of Contents

• What FBA Prep Actually Covers
• Unit Labelling: FNSKU Rules
• Packaging Requirements by Product Type
• Carton Requirements and Limits
• Factory Prep vs Prep Centre vs Amazon
• How to Brief a Chinese Supplier
• How to Verify Prep Before Shipping
• Common Mistakes
• Expert Recommendations
• Frequently Asked Questions
• Conclusion

What FBA Prep Actually Covers

“Prep” is Amazon’s term for everything that makes a unit safe to store, pick and ship inside a fulfilment centre. It has four components:

1. Protective packaging — polybagging, bubble wrap, boxing or taping so the unit survives handling.
2. Unit labelling — applying a scannable FNSKU barcode that identifies the item as yours.
3. Set and bundle handling — making multi-piece products behave as a single sellable unit.
4. Shipment packing — cartons, carton labels, weight and dimension compliance.

Because Chinese factories already have packing lines, adding prep at source usually costs $0.08-$0.35 per unit against roughly $0.55-$1.20 through Amazon’s FBA Prep Service. On a 5,000-unit shipment that difference is meaningful.

Unit Labelling: FNSKU Rules

The FNSKU is the barcode Amazon uses to identify your listing. Get this wrong and inventory can be commingled, misrouted or rejected.

• One FNSKU per unit, on the outside of the packaging where it can be scanned without opening anything.
• Cover any other barcode. Manufacturer UPC or EAN codes must be fully obscured. A visible second barcode is a common rejection cause.
• Correct label stock. Standard sizes are 1″ x 2 5/8″ (30-up) or 2″ x 1″; thermal or laser is fine, inkjet on glossy stock smudges.
• Do not place labels on curved surfaces, seams or over the polybag seal — scanners fail on distortion.
• Do not fold the label around a corner. Reprint at a smaller size instead.
• Print at 100% scale. Suppliers frequently print “fit to page”, shrinking the barcode below scannable density.

Expert tip: Send your supplier a PDF of the FNSKU labels plus a printed physical sample of a correctly labelled unit. Then ask for a photo of the first labelled unit and scan it yourself with a phone barcode app before they run the rest.

Packaging Requirements by Product Type

Amazon applies different prep rules by category. This table covers the requirements affecting most China-sourced consumer goods.

Two details cause most rejections. First, the suffocation warning must be printed on the polybag or applied as a permanent sticker — a loose slip inside does not count. Second, polybags must be sealed, not folded over; a resealable zipper is acceptable, an open-mouth bag is not.

Carton Requirements and Limits

Carton-level errors trigger unplanned service fees and can delay check-in by days during peak season.

Shipping small-parcel direct from China makes carton limits even more important, because they interact with courier dimensional pricing. Our comparison of small-parcel shipping versus freight forwarding for FBA explains when each method wins.

Factory Prep vs Prep Centre vs Amazon

Recommendation: use factory prep once a SKU is stable and the supplier has proven it can follow the specification. Use a China-based consolidator when combining goods from several factories or working with a new supplier. Reserve Amazon’s own prep for emergencies.

How to Brief a Chinese Supplier

Most prep failures are briefing failures. Chinese factories are excellent at following a specification and poor at inferring one. Provide a one-page prep specification containing:

1. An annotated photo of a correctly prepped unit showing label position, bag type and seal.
2. The FNSKU label PDF with an explicit “print at 100%, do not scale” instruction in both English and Chinese.
3. Polybag specification — thickness (1.5 mil minimum), transparency, seal type and the exact suffocation warning wording.
4. Carton specification — units per carton, ECT rating, maximum gross weight, and where the carton label goes.
5. A “do not” list — no labels over seams, no folding labels, no visible manufacturer barcodes, no mixed SKUs without approval.
6. The consequence clause — state in the PO that prep errors requiring rework or Amazon fees are chargeable to the supplier.

Keep the specification version-controlled. When a listing changes and the FNSKU changes with it, reissue the document with a new version number rather than emailing a loose corrected label file.

How to Verify Prep Before Shipping

Prep verification is cheap and belongs inside your pre-shipment inspection scope, not as a separate exercise.

• Scan test. Have the inspector scan a random sample of FNSKU labels and report the read rate. Anything below 100% needs correction.
• Bag seal test. Confirm bags are sealed and suffocation warnings are printed or permanently affixed and legible.
• Carton weigh and measure. Record actual weights and dimensions per carton type, not packing-list estimates.
• Drop test on fragile goods. A 3-foot drop on the weakest face, documented with photos.
• Barcode coverage check. Verify manufacturer barcodes are completely covered, including on the retail box under any outer bag.
• Carton label placement. Confirm labels are flat, not over seams, and both FBA labels are present.

Adding these six checks to a standard pre-shipment inspection typically adds nothing to the fee. If you are unsure how to set sampling intensity, our guide to AQL inspection standards explains how sample sizes are determined.

Common Mistakes

• Printing labels at the wrong scale, producing barcodes too dense to scan reliably.
• Leaving the manufacturer’s UPC visible alongside the FNSKU.
• Using a loose printed suffocation warning instead of printing it on the bag or applying a permanent sticker.
• Exceeding 50 lb per carton without a Team Lift label.
• Assuming the supplier will apply carton labels when the FBA shipment has not yet been created in Seller Central — shipment IDs must exist before the factory can print them.
• Mixing SKUs in one carton without declaring it in the shipment plan.
• Skipping the first-article label check and discovering the error after 8,000 units are bagged.
• Not charging prep failures back to the supplier, which removes any incentive to improve.

Expert Recommendations

1. Always run a first-article prep approval. One photographed, scanned unit approved in writing before mass prep begins prevents the majority of failures.
2. Create the FBA shipment plan early so carton labels and shipment IDs are available to the factory before packing.
3. Order 2-3% spare labels for damage replacement at destination.
4. Standardise carton counts across SKUs where possible — it simplifies both prep and receiving.
5. Keep a physical golden sample of the prepped unit at your office and one at the factory.
6. Write prep responsibility into the PO, including chargebacks for Amazon unplanned service fees.
7. Re-verify after any listing change, because a new FNSKU invalidates every existing label.

For official guidance on import documentation that accompanies FBA freight, the U.S. Customs and Border Protection basic import and export resource is the authoritative reference. If you also need help identifying and qualifying the factory itself, start with our product sourcing service.

Frequently Asked Questions

Can my Chinese supplier apply FBA labels?

Yes, and it is usually the cheapest option at roughly $0.08-$0.35 per unit. Provide the FNSKU PDF with a strict “print at 100%” instruction, an annotated photo of correct placement, and require a first-article photo you can scan before mass production.

What happens if FBA prep is wrong on arrival?

Amazon may apply unplanned service fees per unit, place the shipment on hold, or in serious cases refuse and return it at your expense. Because the goods are already in the destination country, correction usually means paying a domestic prep centre to unpack and relabel.

Do all products need a polybag?

No. Polybags are required for soft goods, textiles and items that could be soiled or damaged by handling. Bags with an opening of 5 inches or more must carry a suffocation warning printed on the bag or permanently affixed.

What is the maximum FBA carton weight from China?

The standard limit is 50 lb / 22.7 kg. Cartons between 50 and 100 lb require a “Team Lift” label, and heavier cartons need “Mech Lift” marking. Individual units heavier than 50 lb are handled under separate oversize rules.

Should I use a China prep centre or ship direct from the factory?

Ship direct once the SKU is stable and the factory has proven it follows the prep specification. Use a China-based prep or consolidation centre when combining goods from multiple suppliers, when the supplier is new, or when bundles are complex.

Do I need the FBA shipment created before the factory packs?

Yes, if you want the factory to apply carton labels. Shipment IDs are generated in Seller Central and cannot be produced by the supplier. Create the plan before packing begins to avoid a relabelling step.

Can I charge prep errors back to my supplier?

Yes, provided the purchase order states it. Include a clause making the supplier liable for rework costs and Amazon unplanned service fees arising from prep that does not match the written specification.

Conclusion

FBA prep is a specification problem, not a manufacturing problem. Chinese factories reliably execute what is written down and improvise what is not, so the outcome depends on the one-page prep brief you send and the first-article approval you insist on. Get FNSKU scale, barcode coverage, polybag sealing, suffocation warnings and carton limits right at source, verify them inside your pre-shipment inspection, and make prep failures chargeable in the PO.

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