Amazon prep is the process of preparing inventory to meet FBA receiving standards before it ships to a fulfillment center.
Every unit that enters an Amazon fulfillment network needs correct labels, protective packaging, and category-specific documentation. Miss a requirement and Amazon either charges an unplanned service fee, refuses the shipment, or in some cases destroys the units. For brands sending thousands of units per week, prep is either a full-time internal function or a service they buy from a specialist. This article walks through what prep actually includes, what it costs, and the decision points that push most brands toward outsourcing.
What Is Amazon Prep?
Amazon prep is the set of physical preparation tasks required before inventory is accepted at an FBA fulfillment center. Core tasks include applying FNSKU barcodes to each unit, poly-bagging items with a suffocation warning printed on the bag, bubble-wrapping fragile SKUs, boxing sets and multi-packs so they arrive as one sellable unit, and labeling expiration dates on consumables.
Prep also includes shipment planning inside Seller Central, palletizing for LTL freight, and generating carton content labels. If any of these steps are wrong, Amazon flags the shipment on arrival.
Claim: Third-party sellers account for 60% of Amazon paid units. Source: Amazon 2023 Annual Report Date: 2024-02-01
What Prep Requirements Apply to Which Products
Not every SKU needs the same prep. Amazon assigns requirements by product type and packaging:
| Product Type | Required Prep |
|---|---|
| Loose apparel | Polybag with suffocation warning |
| Glass or ceramic | Bubble wrap, box-in-box for over 4 oz |
| Powders, pellets | Polybag, sealed |
| Sharp objects | Full enclosure, protective wrap |
| Baby products | Polybag, transparent |
| Consumables | Expiration date label, min 105 days shelf life on arrival |
| Multi-packs | ”Sold as set” or “Do not separate” sticker |
Case-pack quantities also matter. Cartons over 50 lbs need “Team Lift” labels. Anything over 100 lbs is refused.
Claim: Amazon operates more than 175 fulfillment and sortation centers in North America. Source: MWPVL International Date: 2024-01-15
What Third-Party Prep Centers Actually Do
A prep center receives your inventory from suppliers or manufacturers, inspects it, applies FNSKU labels, performs the required prep steps, builds shipment plans in your Seller Central account, and dispatches to the fulfillment center Amazon assigns.
Most prep centers also offer receiving from container freight, storage between shipments, returns processing (unsellable inspection, relabeling, and reinjection), and FBM order fulfillment for the same SKUs. A few offer removal-order consolidation so you can pull inventory out of FBA and repackage it for wholesale or DTC channels.
Look for prep centers located within one or two days’ ground freight of major FBA hubs (Southern California, Dallas, Chicago, Northeast New Jersey). Freight cost is often larger than the prep fee itself.
What Amazon Prep Costs
Standard prep runs $0.50 to $2.00 per unit at most third-party centers. Bundling, fragile handling, and expiration date labeling sit at the higher end. Storage adds $0.35 to $0.75 per cubic foot per month. Receiving fees are usually $5 to $15 per carton or a flat rate per pallet.
Compare that against Amazon’s own unplanned service fees, which apply when a shipment arrives non-compliant.
Claim: Amazon charges $0.80 per unit for unplanned polybagging service. Source: Amazon Seller Central Fee Schedule Date: 2024-01-17
If you ship 2,000 units per week and 20% arrive needing rework, the unplanned fee alone is $320 weekly. A prep center that charges $0.60 per unit to do it right the first time costs $1,200 for the same volume but eliminates delays and long-term storage penalties from stranded inventory.
When Brands Should Outsource Prep
Move to a prep center when any of these conditions apply:
- Weekly FBA volume exceeds 500 units. Below that, in-house prep with a folding table and label printer works. Above it, prep starts eating warehouse hours.
- SKUs require polybagging, bundling, or expiration labeling. These tasks scale badly in-house without dedicated equipment.
- You import from overseas. Prep centers near ports (Long Beach, Savannah, Newark) can receive containers, prep, and forward without you touching the inventory.
- You sell across FBA, FBM, and wholesale. A prep center that handles all three channels means one inventory pool instead of split stock.
- Prep labor competes with product development, marketing, or customer service. Founders and small teams lose more revenue to distraction than they save on prep costs.
Claim: Small US third-party sellers averaged $250,000 in annual sales in 2023. Source: Amazon Small Business Empowerment Report 2023 Date: 2023-11-14
At that revenue, most brands are already past the volume threshold where outsourcing pays for itself.
When to Keep Prep In-House
In-house prep still makes sense for:
- Sellers moving fewer than 200 units weekly with simple, non-fragile SKUs
- Brands with existing pick-pack operations serving DTC and wholesale, where FBA is a small share of volume
- Sellers testing new SKUs before committing to a prep partner
- Categories with unusual handling (custom engraving, kitting with variable components) where a generic prep center adds mistakes
If you already run a warehouse for wholesale orders to independent retailers, adding FBA prep to that workflow is often cheaper than outsourcing, provided your team learns the labeling and polybagging rules.
Claim: More than 2 million independent retailers operate across the US. Source: US Small Business Administration Date: 2023-08-01
How to Pick a Prep Center
Ask every prep center these questions before signing:
- What is the per-unit cost by prep type? Get pricing for FNSKU labeling, polybagging, bubble wrap, bundling, and expiration labeling separately.
- How long from receiving to shipment departure? Two business days is the standard. Anything over five is a warning sign.
- Do they photograph incoming shipments? You need proof of condition for supplier disputes.
- What is the returns process cost? Unsellable inspection, relabeling, and reinjection each carry separate fees.
- Which FBA warehouses do they typically ship to? Their location determines your inbound freight cost.
- Do they carry insurance on stored inventory? Confirm limits and whether it covers fire, water, and theft.
- Can they scale during Q4? Prep centers get overwhelmed in October and November. Ask about surge capacity and cutoff dates.
Also check whether the prep center offers integration with your ordering system. Manual PO uploads waste time once you cross a few dozen SKUs.
Claim: Amazon’s global net sales reached $574.8 billion in 2023. Source: Amazon 2023 Annual Report Date: 2024-02-01
The scale of the platform means prep mistakes compound quickly. A single mislabeled shipment can delay a listing during a peak sales week.
Where Prep Fits in the Wholesale-to-Amazon Flow
For brands selling both wholesale to independent retailers and FBA to Amazon shoppers, prep is one node in a longer supply chain. Suppliers ship case-pack quantities to your prep partner. The prep partner splits inventory: some cartons ship intact to wholesale customers, others get individually prepped and sent to FBA. This split model lets one pool of inventory serve both channels without double-handling.
If you are sourcing from a B2B marketplace that already ships in FBA-ready case packs, prep costs drop because much of the work (barcoding, polybagging, expiration labels) is done at the manufacturer. Case-pack sourcing paired with a nearby prep center is the lowest-friction path from wholesale purchase to FBA shipment.
Emerging brands looking to reach both independent retail buyers and Amazon sellers through a single wholesale channel can Apply to Join Catalist AI, where authorized retailers and prep-ready sourcing sit in one platform.