Case Pack Labeling: The Service Amazon Sellers Search For

By Bernardo Campelo, Forbes Business Council E-Commerce Leader and Founder of PrepVia, an Amazon SPN Certified prep center.

Does a carton of identical units need one label, or one on every unit inside? That is the question behind a search for a case pack labeling service, and the answer decides what the service actually does.

Case pack labeling is the labeling job that appears the moment a seller stops ordering single units from a factory and starts ordering by the carton. And the most common assumption about it is wrong: that a case pack lets you skip the unit label. It does not. Amazon wants an Amazon barcode on every unit inside the case. What a case pack changes is everything around that label: how the carton is received, how its contents are declared, and whether the shipment qualifies for the placement option with no fee. Get that wrong, and a shipment pays for work it never needed.

Two Labels, Two Jobs: The Unit Barcode and the FBA Box ID Label

Every conversation about case pack labeling starts by untangling two labels that get called by the same name. One identifies a single retail unit and has to sit on that unit no matter how it travels. The other identifies the carton: the FBA Box ID label that Send to Amazon prints for every box in the shipment. Neither one replaces the other. Sellers who have only ever shipped loose units usually learn this the day a case pack shipment gets flagged at receiving.

The FNSKU: One Barcode, One Unit

The FNSKU is the barcode tied to your seller account. Since March 31, 2026, every reseller has to put an Amazon barcode on every unit, even when the product already carries a manufacturer barcode, and that includes authorized resellers. Only a brand representative in Brand Registry, with a product that qualifies, can ship on the manufacturer barcode instead. We cover what the FNSKU is and what it is not in the guide on FNSKU labeling and in the breakdown of FNSKU versus UPC versus the manufacturer barcode. A case pack changes nothing about this. Amazon's label placement rules say every item in a case pack needs an Amazon barcode, and any barcode on the case has to come off. The label still has to be readable, and it still has to cover the manufacturer's own barcode on the unit.

The FBA Box ID Label: One Label, One Carton

The carton gets its own label, and it is not the one the factory printed. Every box in an FBA shipment needs its own unique FBA Box ID label, printed from Send to Amazon, and on a pallet every box still carries its own Box ID label on top of the four pallet labels. What is inside the box travels as data, not as a sticker: the box content information entered in the shipment plan. For a case-packed SKU that data is simple. You mark the SKU as case-packed, you give the units per box, and every carton of that SKU has to hold exactly that number. Skip the box content and Amazon charges a manual processing fee of $0.15 per unit from January to October and $0.30 per unit in November and December, per its manual processing fee page, and the shipment is received more slowly. Amazon's box content page still lists $0.10 and $0.15 for the same months, so check both before you plan around the number.

What Amazon Counts as a Case Pack

Amazon's definition is narrow, and it is worth reading before you plan around it. Every unit in the box has the same SKU and the same condition, and the manufacturer packed them together. Every box of that product holds the same quantity, so a case pack of 24 always holds 24. The limit is 150 units per case. At receiving, the fulfillment center scans one unit from the box and puts the box into inventory. It does not scan every unit, because they are all the same.

That last point is where most of the confusion starts. Scanning one unit instead of every unit is a receiving shortcut. It is not a labeling exemption. The unit Amazon scans has to carry the right barcode, and so does every unit behind it, because each one will be picked and shipped to a customer on its own. If a unit that needs an Amazon barcode arrives without one, Amazon marks it as defective and reports it on your Inbound Performance Dashboard, per its barcode labeling FAQ. Reseller units that arrive without proper Amazon barcodes are also not eligible for reimbursement if they are damaged or cannot be traced, per Amazon's FBA Prep Service page.

Two more details catch wholesale accounts. A manufacturer sometimes packs several inner case packs inside one bigger master carton, and Amazon's packaging rules say that bigger box does not qualify as a case pack and has to be broken down to the case pack level. And for expiration-dated products, the date has to show on the outside of the case and on every unit inside it.

The One Exception: Brand Owners on the Manufacturer Barcode

There is one way a case goes in without a sticker on each unit, and it belongs to brand owners. A brand representative in Brand Registry can ship a product on its manufacturer barcode when the product is new, carries a single scannable UPC, EAN or ISBN that matches a single ASIN, and is registered to the brand. The units inside the case already carry the barcode Amazon scans, so the case can travel closed, with its outside barcodes covered and its FBA Box ID label applied. We cover who qualifies in the piece on manufacturer barcode as FNSKU for brand owners. A wholesaler buying the same case from a distributor does not qualify, even with the brand's authorization.

Labeling Inside the Case Without Losing the Case

For a reseller, this is what the service actually is. The case gets opened, every unit inside gets its FNSKU over the manufacturer barcode, and the same units go back into the same carton in the same count, so the carton still meets Amazon's case pack definition. The barcodes on the outside of the case get removed or covered, and the FBA Box ID label goes on. Done well, the case leaves the prep center looking almost exactly the way it arrived, with an Amazon barcode on every unit inside.

The cheapest version of this job happens at the factory. A supplier who applies your FNSKU before sealing the case removes the open-and-reclose step. What is left for the prep center is verification: open a sample, confirm the label matches the product, confirm the count, and close it again. Either way, the decision is made before the carton ships, not after it arrives.

The Box Content: What the Plan Has to Say About Each Carton

Box content information carries the count and identity of what is inside each carton, and Amazon's shipment tools take it directly from the numbers entered into the plan. We walk through the exact fields in the guide on adding box content information to an FBA shipment. Getting the count wrong here does not just risk a delay. A carton declared at forty units that contains thirty-eight becomes a discrepancy the moment it is checked, and that discrepancy follows the shipment through reconciliation.

The declared count has to match three things at once: the physical count inside the case, the units per box entered in the shipment plan, and the SKU on the unit barcodes inside. Sellers who build a shipment plan from a spreadsheet and pack the physical cartons separately, often at a different time and by a different person, are the ones who see these three numbers drift apart. A prep center that receives and labels in the same pass closes that gap, because the count in the plan reflects the case sitting in front of the person labeling it, not a number copied from an order confirmation weeks earlier.

A Master Carton With Nothing Amazon on It Is Normal

A wholesale buyer who orders by the pallet regularly receives cases straight from the manufacturer with nothing Amazon-related on them. Sometimes the carton is blank. Sometimes it carries the manufacturer's own shipping label, addressed to the seller rather than to a fulfillment center. That is normal, and it is not what forces the case open. The FBA Box ID label comes out of Send to Amazon for every shipment anyway. What forces a reseller's case open is the unit barcode: the units inside carry the manufacturer UPC, and a reseller has to cover it with an FNSKU.

So the carton gets opened, every unit counted against what the paperwork claims, and each one labeled. That labeling was always needed, in a case or out of it. The expensive mistake is a different one: breaking the case into loose units and repacking them into mixed boxes. The shipment then loses the one scan per case at receiving, needs new boxes with 2 inches of cushioning around the items, which a manufacturer case pack does not need, and usually loses the identical cartons that open the placement option with no fee. That reversal is the single biggest cost swing in this part of FBA prep, and it happens quietly, on the receiving dock, long after the purchase order was placed and paid for.

The Manufacturer's Own Case Code Has to Be Covered

Many manufacturers already print their own case-level barcode on the master carton, usually an ITF-14 or a similar case GTIN, built for their own warehouse and retail distribution, not for Amazon. It looks official. It scans on a handheld reader. Sellers who see a barcode already on the box reasonably assume the case is covered and move on to the next pallet.

Amazon wants the opposite of leaving it there. Any scannable barcode on the outside of a shipping box has to be removed, covered with opaque tape, or crossed out with a black marker, per Amazon's packaging requirements, so the wrong code is not scanned by accident at receiving. A case pack labeling service uses the manufacturer's case code as information, useful for confirming the SKU and the count, then covers it and applies the FBA Box ID label. Leaving it exposed because the carton already looks labeled is an easy way to get a case scanned as the wrong thing at receiving.

What Case Pack Labeling Actually Costs at Volume

Every unit needs its label either way. What changes is everything around the label. The table below takes one thousand units that arrive from the manufacturer in fifty identical case packs of twenty, and handles them three ways.

The first row is where most of the wasted spend actually happens. A seller who orders in case packs and lets them get broken down needs the same 1,000 labels as the second row, then pays again in boxes, cushioning, slower receiving and, very often, a placement fee. Skip the box content on top of that, and at the rates on Amazon's manual processing fee page, one thousand units add $150 from January to October, or $300 in November and December. The value of a case pack labeling service is keeping the case a case while every unit inside gets labeled, and catching the cartons that do not match before they reach the fulfillment center.

Amazon's optimized split needs at least five identical cartons or pallets per item, with the same quantity and the same item mix in each, and it sends the shipment to five or more locations that you arrange transport to. For a wholesaler shipping case packs by the pallet, the carton rule is usually easy to meet. Compare the freight to each location against the placement fee before you choose.

Where Wholesale and Distributor Volume Change the Math

This entire topic matters most to the accounts we work with under wholesale and distributor prep, because those are the sellers actually receiving pallets of manufacturer case packs rather than ordering single units from a factory. A wholesaler moving several thousand units a week through case-packed cartons either keeps those cases intact through labeling, or loses the case advantages silently across every pallet that gets broken down on arrival.

PrepVia labels inside the case and closes it again, and our standard prep window is 24-36 hours whether the shipment arrives as case packs or loose units. What a wholesale account needs is every case checked against the shipment plan on arrival, every unit labeled, the outside barcodes covered, and the case closed in the same count it arrived with. See how that runs on the FBA labeling service page, and the guide on the wholesale FBA prep workflow for how case pack volume moves through a prep center end to end.

None of this changes the payment terms or the certification behind the work. Net-30 still applies, and the labeling still runs under the same Amazon SPN Certified process whether the shipment is a single pallet of case packs or a mixed load of loose units and cartons in the same truck.

Frequently Asked Questions

What is a case pack labeling service?

A case pack labeling service puts an Amazon barcode on every unit inside a manufacturer case, covers the barcodes on the outside of the case, closes the case again in the same count, and applies the FBA Box ID label. It also checks each case against the shipment plan, so the units per box you declared match what is physically inside.

Do I need to label every unit inside a sealed case pack?

Yes, unless you are the brand representative in Brand Registry and the product qualifies for the manufacturer barcode. Amazon requires an Amazon barcode on each item in a case pack and wants any barcode on the case removed. Since March 31, 2026 this applies to every reseller, including authorized resellers. The case pack only saves the scan: the fulfillment center scans one unit from the box instead of every unit.

What is box content information and why does it matter for case-packed cartons?

Box content information tells Amazon what is inside each carton, and it lives in the shipment plan, not on a sticker. For a case-packed SKU you declare the units per box once, and every box of that SKU has to hold that count. If you skip it, Amazon charges a manual processing fee, $0.15 per unit from January to October and $0.30 per unit in November and December on its manual processing fee page ($0.10 and $0.15 on its box content page), and receives the shipment more slowly. Every box still needs its own FBA Box ID label either way.

Can a case pack ship into FBA without ever being opened?

Only in two situations. A brand representative whose product qualifies for the manufacturer barcode can send the case closed, with the outside barcodes covered and the Box ID label applied. A reseller can send it closed only if the supplier applied the FNSKU to every unit before sealing it. In every other case, the carton has to be opened so each unit gets its Amazon barcode.

What happens if a master carton arrives at the prep center with nothing Amazon-related on it?

Nothing unusual. The FBA Box ID label is printed from Send to Amazon for every shipment, so a blank carton is normal. For a reseller, the carton gets opened, the units counted against the paperwork and labeled, and the same units go back in the same count so the case still qualifies as a case pack. The expensive path is breaking it into loose units and repacking them.

Does the manufacturer's own case code count as Amazon's label?

No, and it cannot stay visible. A manufacturer's case GTIN or ITF-14 is built for that manufacturer's own logistics. Amazon wants any scannable barcode on the outside of a shipping box removed, covered with opaque tape or crossed out with a black marker, so the wrong code is not scanned at receiving. The carton carries Amazon's FBA Box ID label instead, and every unit inside still needs its own Amazon barcode unless the brand-owner exception applies.

How much does case pack labeling cost compared to labeling loose units?

Pricing is quoted per account on a free 15-minute call. The savings come from the case. A case that stays intact needs no new box or cushioning, gets one scan at receiving, carries a box content count that is right by design, and five or more identical cartons per item qualify for Amazon's optimized split with no placement fee. A case that gets broken into loose units loses all of that.

Final Take

A seller searching for a case pack labeling service is not looking for a novelty. The question behind the search gets more expensive to get wrong as volume goes up: does this carton need one label or a thousand? For a reseller, the answer is a thousand, one on every unit, plus one Box ID label on the outside. The question that actually moves the cost is a different one: does the case survive the labeling?

Most of the cost in this part of FBA prep is not the label itself. It is the gap between what a seller assumes about a case pack and what Amazon actually requires from it. A carton that looks finished because the manufacturer already printed a barcode on it still needs that barcode covered and every unit inside labeled. A carton that looks unfinished because it carries no printing at all is normal, because the Box ID label comes from the shipment plan.

Treat case pack labeling as its own decision, made once per SKU and confirmed again every time the case configuration changes, rather than an assumption carried over from the last shipment that happened to work. Get that decision right, and volume becomes an advantage instead of a recurring line item nobody can explain.

If your catalog moves through case packs by the pallet rather than by the piece, budget a label for every unit, protect the case, and ask your supplier whether the FNSKU can go on before the next container leaves the factory.