Run this before every FBA shipment leaves. One missed item is a rejection.
Since Amazon ended in-house prep in January 2026, every unit must arrive fully prepped — or it gets refused, charged a defect fee, or your shipping privileges get restricted. Tick each item as you prep. Your progress saves in this browser, so keep it open while you pack. No login.
Two changes raised the stakes this year. First, Amazon ended its in-house prep and labeling service on January 1, 2026 — there's no longer a paid safety net at the fulfillment center, so anything not prepped before it ships is your problem. Second, receiving is increasingly automated: conveyor systems and robots are built for specific box sizes and clean barcodes, and anything that breaks that flow gets flagged, delayed, or refused.
The cost of a single rejected shipment isn't just the rework. Units sit unresolved in receiving, blocking sales; stockouts hurt your Best Seller Rank; and repeated violations can restrict your ability to create future shipments or, in severe cases, put a hold on the account. Catching it on this checklist costs nothing. Catching it at the warehouse costs hundreds.
What a failed shipment actually costs in 2026
Since Amazon ended in-house prep on January 1, 2026, a non-compliant inbound shipment now carries a defect fee of roughly $0.32–$5.72 per unit (a consolidated missing/late/misrouted charge averages about $0.60), on top of rejection and delay. And if Amazon damages compliant stock in the warehouse, since March 10, 2025 it reimburses at manufacturing cost, not retail — so clean inbounds and active reimbursement audits both protect the same margin. Estimate what Amazon owes you →
The numbers worth memorizing
Box max: 36" (L) × 25" (W) × 25" (H), and 50 lb. Minimum 6"×4"×1" and at least 1 lb.
Over 50 lb (single oversized item only): Team Lift label on top + all four sides (5 total). One label on top alone is non-compliant.
Over 100 lb: replace Team Lift with a Mechanical Lift label, same five placements.
Poly bags with a 5"+ opening: suffocation warning required.
Inbound placement fee: about $1.74/unit if Amazon splits your inventory across FCs.
The three labels every box needs
Sellers confuse unit labels with box labels. They're separate, and a shipment with perfect cartons still fails if either is wrong. Every sellable unit needs a scannable barcode (FNSKU or manufacturer barcode). Every box additionally needs a unique FBA Box ID label and a carrier label, plus box content information uploaded with the shipment. Missing any one triggers receiving delays or non-compliance fees.
How to run this checklist without doubling your prep time
The checklist above is ordered the way a shipment actually moves through your garage or prep room — units first, protection second, boxes third, labels and data last. Working it in that order matters. The most common self-inflicted failure we see described by sellers is prepping in the wrong sequence: boxing everything, then discovering a missing suffocation warning on layer one, then unpacking the lot. Run the unit-level group to 100% before a single item goes in a box, and the box-level groups become a five-minute pass instead of a re-pack.
Progress saves in your browser per device, so the practical workflow is: open this page on a phone or tablet that stays in the prep area, tick as you go, and hit Reset between shipments. Items marked critical are the ones that trigger refusals or defect fees on their own; everything else mostly costs you receiving delays. If you're short on time, the critical items are the floor, not the whole list.
The five ways FBA shipments actually fail
Nearly every inbound problem lands in one of five buckets. Knowing which bucket you're exposed to tells you where to spend checking effort.
1. Unscannable or conflicting barcodes. Receiving is built around one scan per unit. A visible manufacturer UPC next to your FNSKU, an inkjet label that smeared in a humid container, or a barcode wrapped around a curved bottle all read as "unscannable" — and unscannable units are what the stranded-inventory and manual-processing fees exist for.
2. Prep that doesn't match the category. Amazon assigns prep requirements per SKU (poly bagging, bubble wrap, taping, sold-as-set). The failure mode isn't ignorance of the rule — it's that the requirement changed after you first created the SKU, and nobody re-checked. Prep requirements shown at shipment creation are the ones you're graded against, so read them fresh each time rather than prepping from memory.
3. Box spec violations. The 36" × 25" × 25" and 50 lb ceilings are hard limits for standard receiving; the 6" × 4" × 1" and 1 lb floors are the quiet ones that catch sellers shipping a single small carton. Over-50-lb boxes without Team Lift labels on all five required faces are treated as a safety violation, which is a faster route to shipment-creation restrictions than an ordinary defect.
4. Label/data mismatches. Every box needs its own FBA Box ID, a carrier label, and box content information that matches what's physically inside. The subtle failure is a real-world last-minute change — you pull two defective units out of box 3 and don't update the content data. The count mismatch flags the whole shipment for manual receive, which can add days.
5. Freight-specific misses. For LTL/FTL, pallets that are over-height, single-way, non-ISPM-15, or labeled only on top fail at the dock before a box is ever opened. If you ship parcel only, the last group of the checklist never applies to you — that's why it's separated.
Worked example: what one rejected shipment does to a real P&L
Take an illustrative 200-unit replenishment of one SKU. Using the defect-fee range Amazon publishes for inbound non-compliance ($0.32–$5.72 per unit, with the common consolidated charge averaging about $0.60), a labeling defect across the lot books roughly $64–$1,144 in fees alone — call it about $120 at the average. That's the visible cost.
The invisible costs are usually bigger. Units flagged for manual processing can sit in receiving for days to weeks; if this SKU sells 15 units a day, a ten-day delay is 150 lost sales, plus the Best Seller Rank decay that follows a stockout, plus the ad spend you keep paying into a listing that can't convert. A $120 defect fee routinely travels with four figures of opportunity cost. That asymmetry — five minutes of checklist versus a four-figure downside — is the entire argument for running this page every time, not just on new SKUs.
Two adjacent numbers complete the picture. If Amazon splits your inventory across fulfillment centers, the inbound placement service fee (about $1.74/unit on this page's published figure) is a cost you can partly control at shipment creation by choosing fewer destinations at a lower fee tier. And when compliant stock is lost or damaged by Amazon after receive, reimbursement has been paid at manufacturing cost rather than retail since March 10, 2025 — meaning clean inbounds and a regular reimbursement audit are two halves of the same margin defense.
Timing: when compliance pressure peaks
Receiving standards are constant, but their cost isn't. In Q4, fulfillment centers run at capacity and manual-processing queues are longest — the same defect that costs you three days in March can cost you three weeks in November, which for seasonal inventory can mean missing the sales window entirely. Amazon also publishes annual holiday inbound deadlines each fall; a shipment bounced for prep issues near those cutoffs often cannot be fixed and re-sent in time. Practical rule: in September and October, treat every item on this checklist as critical, because the recovery time you'd normally rely on doesn't exist.
Questions sellers ask about FBA shipment prep
Can I use the manufacturer barcode instead of an FNSKU label?
Sometimes — Amazon allows manufacturer-barcode tracking for eligible new products when the barcode is unique to your listing and the item isn't commingled-restricted. But if multiple sellers stock the same UPC, your inventory can be commingled with theirs. Labeling with FNSKU keeps your units yours; that's why this checklist treats "FNSKU covers the UPC" as critical whenever you've chosen FNSKU tracking.
Amazon ended in-house prep — can I still pay someone to prep for me?
Yes. What ended on January 1, 2026 is Amazon's own paid prep and labeling inside fulfillment centers. Third-party prep centers still operate normally, and for many sellers they're now the only alternative to self-prep. If you use one, this checklist still applies — you're accountable for their work, so spot-check a sample of each outbound lot.
Do I really need box content information for every box?
Yes — every box in every shipment plan needs content data (entered manually, via 2D barcode, or through an integrated feed). Shipments without it are received manually, which is slower and can carry a per-unit manual-processing charge. If you use prep or inventory software, the 2D barcode option removes the most error-prone manual step.
What should I do the moment a shipment shows a problem in Seller Central?
Open the shipment's contents and reconcile counts first — don't file a case immediately. Amazon's own receiving process resolves many discrepancies within its published investigation window. If units are still missing or a defect charge looks wrong after reconciliation closes, file with your carrier proof (weights, tracking, BOL for freight). Keep the paper trail from this checklist's data step; it's exactly the evidence those cases need.
Sources & how this page is maintained
This checklist and guide are compiled from Amazon's published US FBA documentation in Seller Central — the packaging and prep requirements, shipping and routing requirements, FBA box, pallet and weight requirements, box content information help pages, and Amazon's 2025–2026 fee-change announcements (in-house prep retirement, inbound defect fees, reimbursement policy). Marginely is an independent seller-tools site: we are not affiliated with, endorsed by, or compensated by Amazon, we don't accept payment to alter guidance, and figures on this page are Amazon's published rates, not our estimates. Requirements change; we review this page against the current Seller Central text on a recurring cycle and after each Amazon fee or policy announcement. If you find something out of date, tell us via the about page and we'll verify against the source and correct it.
Last reviewed: August 6, 2026 · next scheduled review with Amazon's next US FBA fee/policy announcement.