Amazon FBA Prep Services: Requirements, Common Mistakes, and How a 3PL Can Help
Amazon's fulfillment network is one of the most efficient logistics operations ever built. It can pick, pack, and ship a product to a customer's door in two days — sometimes one — at a cost that would be impossible for most brands to replicate independently. But that efficiency comes with a condition: your inventory has to arrive at Amazon's warehouses exactly the way Amazon wants it.
Not approximately. Exactly.
If your cartons are the wrong dimensions, your labels are in the wrong location, your poly bags are missing suffocation warnings, or your items arrive unboxed when they should be boxed — Amazon will either refuse the shipment, quarantine it, charge you for remediation, or dispose of the products. Any of those outcomes cost you money and delay your launch or restock.
This is what the FBA prep process is about: making sure every unit you send to an Amazon fulfillment center complies with Amazon's Seller Central requirements before it ever leaves your facility. And increasingly, smart sellers are outsourcing that work to a third-party logistics provider — a prep center — rather than trying to manage it in-house.
This guide covers the current FBA requirements in practical detail, the most common prep mistakes that cause shipments to be rejected or charged back, the honest tradeoffs between DIY prep and outsourcing, and how an experienced 3PL handles FBA prep at scale.
What Is Amazon FBA Prep?
FBA stands for Fulfillment by Amazon. You send your inventory to Amazon's warehouses; Amazon stores it, picks and packs individual orders, and ships them to customers. You pay storage fees and fulfillment fees per unit. In exchange, your products are eligible for Prime and backed by Amazon's customer service.
The catch is that Amazon sets strict inbound requirements for every product that enters their fulfillment centers. These requirements cover:
- Labeling: Every unit must have a scannable FNSKU barcode in the right location. Manufacturer barcodes may need to be covered or removed.
- Packaging: Products must be packaged to survive warehouse handling, conveyor belts, and sorting systems — not just shipping.
- Poly bagging: Soft goods, loose items, and anything that could spill or scatter must be in poly bags that meet specific specifications.
- Bundling: Multi-pack and bundled items must be clearly labeled as a set and secured so they cannot be separated in the warehouse.
- Carton limits: Master shipping cartons must stay within Amazon's dimension and weight limits.
- Category-specific rules: Hazmat products, liquids, fragile items, and sharp objects each have additional requirements.
FBA prep is the work of taking your product — fresh off a production run or out of an import container — and turning it into inventory that meets every one of those requirements before it ships to a fulfillment center.
Current FBA Packaging and Labeling Requirements
Amazon's full requirements live in Seller Central and get updated periodically. What follows is a working summary of the most important rules as of 2026. Always confirm against your Seller Central account before sending a shipment.
FNSKU Labeling
Every unit in an FBA shipment must carry a Fulfillment Network Stock Keeping Unit (FNSKU) barcode. This is an Amazon-generated barcode that's unique to your product listing — it's not the same as a UPC or manufacturer barcode.
FNSKU labels must be:
- Generated from Seller Central for your specific ASIN
- Scannable (1D or 2D barcode, minimum size: 1" x 2")
- Placed on a flat, exterior surface where it's easily accessible to a scanner
- Not covering any other barcode, including manufacturer barcodes
If your product already has a manufacturer barcode on the packaging, you have two options: apply an FNSKU label directly over the manufacturer barcode (completely covering it), or opt into Amazon's barcode service at $0.30 per unit (they apply labels at the fulfillment center, but you lose speed and add cost).
For most sellers at volume, applying FNSKU labels before shipping is cheaper and faster.
Poly Bag Requirements
Soft goods, loose products, sets of multiple components, and anything that could separate or create a mess in the warehouse must arrive in poly bags. Amazon's poly bag requirements are specific:
- Bag must be clear (transparent)
- Minimum 1.5 mil thickness
- Opening must face down or be sealed with tape or a heat seal
- Suffocation warning required on any bag with an opening larger than 5 inches — either printed directly on the bag ("WARNING: To avoid danger of suffocation, keep this plastic bag away from babies and children") or on a label attached to the bag
- Barcode must be scannable through the bag, or the barcode must appear on the outside of the bag
Missing suffocation warnings are one of the most common causes of FBA receiving defects. They're easy to overlook when you're sourcing bags or printing labels in a rush.
Box and Carton Requirements
Individual product boxes must:
- Be six-sided and close flat with no flaps extending beyond the box edge
- Have all openings sealed with tape
- Not exceed 25 lbs for standard products (some categories allow up to 50 lbs with a "Team Lift" label)
Master shipping cartons have additional limits:
- No single side longer than 25 inches (with limited exceptions for oversized items)
- Maximum weight of 50 lbs (100 lbs for cases that cannot be broken down)
- Carton contents must match what you declared in the shipment plan
Irregular or soft packaging — think polybags used as a master carton — is generally not acceptable for standard products.
Bundling Requirements
If you're selling a multi-pack or a bundle (different SKUs sold together as one unit), each bundle must be:
- Marked with a "Sold as Set" or "Do Not Separate" label visible on the outside of the package
- Packaged so the components cannot come apart in the warehouse
- Listed and sold as a single ASIN
Amazon will not re-bundle separated items in the warehouse. If your bundle arrives loose or separates during receiving, those units often end up in an unfulfillable status.
Category-Specific Rules
Certain categories require additional prep:
- Liquids: Must be in leak-proof packaging, sealed with pressure-sensitive tape or heat seal, and able to withstand a 3-foot drop test
- Glass: Must be cushioned to prevent breakage (bubble wrap or foam), marked as fragile
- Sharp items: Points and edges must be covered to prevent injury during handling
- Hazmat: Full HAZMAT compliance required, including proper labeling, documentation, and — for many products — Amazon's dangerous goods approval process
- Expiration dates: Perishable products must have expiration dates visible on the outside of the unit and master carton
Common Prep Mistakes That Lead to Rejections and Chargebacks
Amazon checks inbound shipments against its requirements, and when something is wrong, the consequences can range from minor (a corrective charge you find on your invoice two weeks later) to severe (shipment refused at the dock, or units destroyed after 30 days in quarantine).
The most common prep failures:
1. FNSKU labels with poor adhesion. Labels that peel, smear, or fail to scan trigger receiving errors. Using cheap label stock, applying labels to curved or glossy surfaces, or printing at incorrect settings all cause this. Amazon expects every label to scan cleanly every time.
2. Missing or incorrect suffocation warnings. Sellers sourcing poly bags from overseas frequently end up with bags that meet the size and thickness requirements but omit the suffocation warning. Amazon considers this a defect.
3. Poly bags that exceed 5 inches without warnings. Many sellers know the rule exists but apply it inconsistently, especially when packaging changes or new SKUs get added to a prep workflow.
4. Barcodes obscured or not covered. If your product has a manufacturer barcode and you apply an FNSKU label without fully covering the manufacturer barcode, scanners can pick up the wrong code. This leads to receiving errors and mislabeled inventory.
5. Overweight or oversized cartons. A carton that exceeds 50 lbs or has a side longer than 25 inches may be refused at the fulfillment center dock or result in a non-compliance fee. This is particularly common when sellers let overseas manufacturers pack master cartons without specifying Amazon requirements.
6. Shipment plan discrepancies. The contents of your physical cartons must match your shipment plan exactly — right SKUs, right quantities, right destination fulfillment center. Discrepancies get flagged and can delay receiving by days.
7. Inadequate bundling. Bundle components that aren't secured together, or that lack "Sold as Set" labeling, frequently get separated during receiving and end up unfulfillable.
DIY Prep vs. Outsourcing to a Prep Center
Every Amazon seller starts by doing their own prep. You order 500 units, spread them out on a table, apply labels, bag what needs bagging, and pack cartons. It takes a few hours, it costs nothing but time, and it works fine when you're small.
It stops working when you scale.
At 2,000 units per SKU, with 10 active SKUs, and new inventory arriving every few weeks, in-house prep becomes a significant operational burden. You're hiring and managing labor, buying equipment (label printers, poly bag machines, heat sealers, scales), managing compliance updates when Amazon changes requirements, and diverting your team's attention from the parts of the business that actually drive growth.
The honest comparison looks something like this:
In-house prep costs:
- Labor: $15-20/hour per worker, typically 30-60 seconds per unit for labeling and bagging
- Equipment: Label printers ($200-800), poly bag machines ($500-2,000), heat sealers ($150-500)
- Materials: Labels, poly bags, tape, dunnage
- Space: Prep work requires floor space that could otherwise be used for storage or production
- Management overhead: Training, quality control, compliance tracking
Outsourced prep costs (typical 3PL rates):
- Receive and inspect: $0.10-0.20 per unit
- FNSKU labeling: $0.10-0.25 per unit
- Poly bagging: $0.15-0.35 per unit
- Carton packing and labeling: $0.25-0.50 per carton
- Total per unit: typically $0.50-1.25 depending on complexity
For many sellers, outsourcing becomes cost-competitive around 1,000-2,000 units per month — and it becomes clearly cheaper once you factor in the hidden costs of in-house operations. Beyond cost, the bigger advantage is compliance confidence: an experienced prep center has done this thousands of times and keeps up with Amazon's requirement changes as a core part of their business.
How a 3PL Handles FBA Prep at Scale
A 3PL that specializes in Amazon prep operates a fundamentally different workflow than in-house prep. The process is systematized, staffed for throughput, and built around compliance rather than convenience.
Here's a typical workflow for an importer:
Step 1: Container arrival and unloading. Your import container arrives at the 3PL facility. The team unloads and counts every carton against your packing list. Damage and discrepancies are photographed and documented immediately, which protects your claim rights with suppliers and freight carriers.
Step 2: Receiving and SKU verification. Units are received into the warehouse management system (WMS), matched to your Amazon shipment plan, and staged for prep. Any quantity discrepancies are flagged before prep begins — not discovered after.
Step 3: Prep execution. Workers follow item-specific prep instructions for each SKU: which label template to use and where to place it, whether poly bagging is required and what bag specification, whether bundles need assembly, and any category-specific requirements. Experienced prep centers maintain a prep sheet for every ASIN so that instructions are consistent across every shipment and every worker.
Step 4: Quality control. Labels are scanned to confirm they're reading correctly. Bags are inspected for suffocation warnings and proper sealing. Carton weights are checked before cartons are sealed. A 3PL that handles Amazon prep routinely will catch the issues that cause chargebacks before they leave the building.
Step 5: Carton packing and labeling. Units are packed into master cartons per your shipment plan, carton labels are applied, and BOL documentation is prepared. The 3PL coordinates the outbound freight booking to Amazon's designated fulfillment centers.
Step 6: Shipment to FBA. Cartons move from the 3PL to the Amazon fulfillment center. Tracking is shared with you, and once Amazon receives the inventory, it typically becomes available for sale within 24-48 hours.
For brands importing from Asia, this workflow has an additional dimension: containers often arrive at a port before moving to a prep facility. Proximity to the port matters — time in transit between the port and the prep facility adds cost and days to your lead time.
The Savannah Advantage for FBA Importers
The Port of Savannah is the third-busiest container port in the United States and the largest single-terminal container port in the country. A significant portion of import volume from Asia — particularly from China, Vietnam, and South Korea — flows through Savannah before distribution to the Southeast, Midwest, and East Coast markets.
For Amazon sellers importing from Asia, this creates a meaningful logistics opportunity. Rather than routing containers to an inland facility far from the port, brands that work with a prep center in the Savannah-to-Columbus corridor can move containers from port to prep to FBA in a compressed timeline.
AnkerPak operates 350,000+ square feet of warehouse and production space across four facilities in Columbus, Georgia — approximately three hours from the Port of Savannah. That proximity means containers can be unloaded, received, prepped, and shipped to Amazon fulfillment centers without the extended drayage times or extra freight legs that add cost and calendar days to the process.
Columbus also sits at a practical crossroads for Amazon fulfillment center routing in the Southeast. Several major FBA warehouses in Georgia, Tennessee, and the Carolinas are within a day's truck freight of Columbus, which simplifies the outbound leg of the FBA shipment.
Why AnkerPak for Amazon FBA Prep
AnkerPak is a contract packaging and 3PL company, not a side-business that does prep as an afterthought. The company operates 11 production lines, handles kitting and assembly for Fortune 500 clients, and manages labeling and packaging programs across a wide range of consumer product categories.
That production infrastructure translates directly to FBA prep capability:
Labeling at volume. AnkerPak's production lines are equipped to handle high-volume labeling operations with the accuracy and throughput that Amazon sellers need during peak periods — a new product launch, a Q4 restock, an unplanned sellout reorder.
Kitting and bundling. Amazon multi-packs and bundles are a natural extension of AnkerPak's core kitting capabilities. Whether you need to assemble a three-piece gift set or create a multi-pack from individual units, the production infrastructure is already in place.
Packaging expertise. Understanding what packaging configurations meet Amazon's inbound requirements — and which category-specific rules apply to your products — is part of what an experienced packaging operation brings. That expertise reduces the back-and-forth that costs sellers time when working with facilities that don't live in the Amazon prep world daily.
Import container handling. AnkerPak's facilities are set up to receive full containers, deconsolidate, and route inventory through prep without the intermediate handling steps that add time and cost. For importers, that streamlined container-to-FBA workflow is a material advantage.
If you're an Amazon seller scaling past the point where in-house prep makes sense, or an importer looking to cut days and costs out of your container-to-FBA timeline, the conversation starts with understanding your current volumes, SKU mix, and prep requirements. AnkerPak works through those specifics to build a service model that fits — not a generic rate card that assumes every product is the same.
Getting Started
Amazon FBA prep isn't complicated, but it is exacting. The requirements exist because Amazon's fulfillment network runs on predictability — every unit that arrives at a fulfillment center needs to be processable without human intervention or special handling. When sellers treat prep as an afterthought, the fulfillment network surfaces that in the form of chargebacks, receiving delays, and unfulfillable inventory.
An experienced prep center treats compliance as table stakes. What it adds on top of compliance is throughput, scalability, and a workflow that gets your inventory from an import container to an Amazon warehouse in the shortest possible time.
For sellers growing their FBA business — or for importers trying to shorten the gap between port arrival and listing availability — the right 3PL partner makes that happen faster and with fewer friction points than managing prep in-house.
Reach out to AnkerPak to discuss your FBA prep requirements and how Columbus-based facilities with Savannah port proximity can support your inbound supply chain.