Operations: fulfilment, packaging & compliance
FBA prep is work done to a unit so a fulfilment centre can store it and ship it alone. Wholesale packaging is work done to a group of units so a warehouse can receive them, count them and put them on a shelf. They are different jobs with different outputs, and the cheapest way to run both is to decide which one your production line produces natively.
Most brands discover this the expensive way, by paying a warehouse to undo one standard and apply the other, case by case, for a year.
What FBA prep actually consists of
Prep exists because an FBA unit travels alone through a building with millions of other units, and has to be identifiable and intact at the end.
A scannable barcode on the outside of the unit, either your manufacturer barcode if you are using that programme or an FNSKU label if you are not. Anything else on the package that looks like a barcode has to be covered, which is why a retail-ready box with a UPC on it often gets a sticker slapped over it.
A poly bag for anything soft, loose, or liable to shed — with a suffocation warning printed on it above a size threshold, and the bag sealed rather than folded.
Bubble wrap or other protection for fragile items, taping for anything that could open, and a set seal for liquids. Multi-unit sets need a sold-as-set marking so a picker does not break them apart.
Boxes for sharp or oversized items, and for anything that cannot survive being handled loose.
The important characteristic of all of that: it is per unit. Every single one gets touched. That is why prep costs scale with volume in a way that wholesale packing does not.
What wholesale packaging actually consists of
Wholesale packing is per case, and it is about identification rather than protection.
The unit has to be retail-presentable, meaning its own package is the package a shopper sees. What changes about the package itself is covered in retail packaging vs Amazon packaging.
Units go into an inner pack if the buyer wants one, usually a light carton or a shrink bundle of a shelf-friendly quantity. Inners then go into a master carton. The reason this middle layer exists is explained in inner packs and master cartons.
The master carton carries markings, and this is the part Amazon sellers have never had to do. Your company name, the item description, the buyer's item number if they issued one, the UPC of the product inside, the case quantity, the PO number, the country of origin where required, and a carton label with a barcode their scanner reads.
Cartons then go on a pallet in a defined pattern, stacked to a height limit, not overhanging the deck, shrink wrapped, with a placard on two adjacent sides.
Nobody opens a unit. Nobody bags anything. The labour is in getting the counts and the markings right, which is why a wholesale order of six hundred units can be cheaper to ship than an FBA shipment of the same six hundred.
The two standards side by side
| FBA prep | Wholesale packing | |
|---|---|---|
| Unit of work | Each unit | Each case |
| Barcode that matters | FNSKU or manufacturer barcode | Manufacturer UPC, plus carton label |
| Other barcodes | Must be covered | Must be visible and correct |
| Bagging | Often required, with warning | Almost never |
| Outer marking | Shipment label only | Full case markings and PO number |
| Who rejects it | Amazon receiving | The retailer's dock |
Read the third row carefully, because it is the single most common conflict. FBA wants competing barcodes hidden. Retail wants the manufacturer barcode exposed and scannable. A unit prepped for one is wrong for the other, and a sticker peeled off in a hurry leaves residue on a package a shopper is meant to pick up.
Which direction should you prep from
There are two workable architectures and one that quietly bleeds money.
Retail-first. Produce the unit in its final retail package, with the UPC printed on it, packed into inners and master cartons at the factory. Ship the cartons to your 3PL. Wholesale orders leave as cases, untouched. FBA replenishments get prepped at the 3PL: open cases, apply the Amazon barcode or use the manufacturer barcode programme, bag where required, repack into shipment cartons.
Amazon-first. Produce the unit already bagged and labelled for FBA, in cartons sized for FBA shipments. Wholesale orders then require stripping labels, sometimes rebagging, and repacking into case quantities the buyer wants.
Retail-first wins for almost every product, for one reason: adding an Amazon barcode to a clean retail package is a sticker, while removing an Amazon barcode from a package destined for a shop is a defect. The exception is products where the retail package is genuinely unsuitable for a solo parcel journey and would need overboxing anyway.
The expensive third option is having no architecture: the factory ships whatever it shipped last time, and the warehouse improvises per order. That is where the special-project labour lines on your 3PL invoice come from.
Can the factory do the prep
Often yes, and it is usually the cheapest place for it, but with two cautions.
The first is that factory prep locks you in. A container of units already bagged and labelled with FNSKUs cannot be sold wholesale without rework, so whatever fraction you prep at source is a fraction committed to Amazon before you know your demand split. How to size that commitment is the subject of inventory split between Amazon and wholesale.
The second is quality control. A bagging error repeated across ten thousand units is discovered at an Amazon fulfilment centre, thousands of miles from anyone who can fix it. A 3PL doing the same job domestically can be corrected in an afternoon.
A reasonable compromise for a brand selling both channels: factory produces retail-ready units in cases, prints the UPC on the package, and does no Amazon-specific work. The 3PL preps FBA shipments on demand from the same stock. You pay a little more per FBA unit and keep every unit sellable in either channel until the last moment.
What changes on your carton spec
Two things that catch sellers out when they first brief a factory for retail.
Case quantity should be chosen for the shelf, not for the container. A case of twenty-four is efficient to ship and hopeless for an independent shop that sells four a month, which is why inner packs exist and why case sizing deserves its own thinking in case packs for retail.
Carton strength matters more in retail than in FBA. Amazon cartons make one journey from your warehouse to theirs. Retail cartons get cross-docked, stacked on mixed pallets, moved to a back room and sometimes put on the shelf as they are. Undersized board shows up as damage deductions on your invoice.
What this costs and why it is worth getting right
Run the numbers on a made-up product to see the shape. A twenty-four dollar retail item, four dollars landed, twelve dollars wholesale, twelve units to a case.
Prepped retail-first, a wholesale order of ten cases is ten pick-and-label operations. Prepped Amazon-first, the same order is a hundred and twenty units to unbag, de-label and repack, plus new cartons and markings. At any plausible warehouse labour rate the second version eats a meaningful slice of the twelve dollar wholesale price, and it does so on every order forever.
That is the real argument. Prep architecture is not a warehouse detail, it is a margin decision you make once and pay for continuously.
Before you commit a production run to one architecture, it helps to know how much wholesale demand is realistic. Paste your listing into WholesalePilot and the preview shows which retailers and distributors stock products like yours, which tells you whether to brief the factory for cases or keep producing purely for the marketplace.