What is FBA Prep? A Complete Guide for Amazon Sellers

On January 1, 2026, Amazon discontinued its in-house FBA prep and item labeling services for U.S. shipments. Sellers can no longer rely on Amazon to prepare inventory after it arrives at a fulfillment center.

Products now need to be properly bagged, labeled, and packaged before they're shipped, making FBA prep a critical step in the fulfillment process. This guide explains what FBA prep is, Amazon's packaging and labeling requirements, how to prepare inventory correctly, and the latest industry trends for 2026.

What is FBA Prep?

FBA prep is the process of getting your inventory ready to be received, stored, and shipped by Amazon's fulfillment network. That covers labeling each unit correctly, packaging it so it survives handling and storage, and boxing it up according to Amazon's shipment requirements.

Your supplier may manufacture a great product, but that doesn't mean it's ready for Amazon. Every item entering Amazon's fulfillment network has to meet specific standards so it can be scanned, stored, picked, and shipped efficiently. FBA prep is the final step that ensures your products enter that system without unnecessary delays or additional handling.

Why Amazon FBA Prep Requirements Exist

I get asked this a lot, usually by someone who's annoyed that they have to buy poly bags for products that seem obviously fine without one. Prep requirements exist because of scale, not caution for its own sake.

Amazon fulfillment centers move enormous volumes of inventory through automated and semi-automated systems every day. A worker pulling your product off a shelf has maybe a few seconds to scan it, check it, and move to the next item. There's no time to inspect packaging quality or guess which barcode on a multi-pack is the real one. The requirements exist so that every unit, from every seller, behaves predictably inside that system.

There's also a liability side to this. Loose items without suffocation warnings, sharp products without protective packaging, and liquids without proper sealing create real safety and damage risks inside a warehouse where products from thousands of sellers sit next to each other.

Once you understand the requirements exist to keep a shared system functional, they stop feeling arbitrary. They still feel like extra work. But at least it's work with a reason behind it.

Who is Responsible for Amazon FBA Prep?

The seller is responsible for making sure every unit meets Amazon's prep, packaging, and labeling requirements before it reaches a fulfillment center. Until the end of 2025, sellers could pay Amazon to perform certain prep tasks, such as applying labels or adding poly bags. That service ended on January 1, 2026, so inventory now needs to arrive fully prepared.

If a shipment doesn't meet Amazon's requirements, it may be delayed, rejected, or require corrective action before it can move through the fulfillment network. Those delays can increase costs and slow down inventory availability.

Some manufacturers, wholesalers, and third-party prep centers offer FBA prep as an additional service, but it's not something you should expect by default. Before shipping inventory to Amazon, confirm who is handling prep and make sure it meets Amazon's current requirements.

Which Products Need Prep and Which Don't

Not every unit needs the same level of prep, and this is where a lot of new sellers either over-prep (wasting time and materials) or under-prep (risking rejection).

Products That Typically Need Prep:

• Anything loose or without its own child-resistant, tamper-evident packaging
• Liquids, powders, and anything that could leak or spill
• Glass, ceramic, or fragile items
• Products that could suffocate a child if the packaging is a loose bag
• Products sold as sets or bundles that don't already come packaged together
• Items with retail stickers, price tags, or a barcode that isn't the FNSKU
• Anything with sharp edges or points not fully enclosed

Products that Generally Don't Need Extra Prep:

• Items sealed in the manufacturer's original retail packaging with no loose components
• Products with durable packaging that can withstand normal handling and storage
• Items that already meet Amazon's packaging requirements and only need the correct FNSKU label applied, where applicable

As a general rule, your inventory should arrive at Amazon in a condition that allows it to be received, stored, picked, and shipped without additional handling. If extra packaging is needed to protect the product or meet Amazon's requirements, it should be completed before the shipment is sent.

Amazon FNSKU Labels

The FNSKU (Fulfillment Network Stock Keeping Unit) is Amazon's own barcode, unique to your seller account and that specific listing. It's how Amazon's system tracks which unit belongs to which seller, separate from the manufacturer's UPC or EAN.

If you're using Amazon's standard fulfillment (not "Stickerless, Commingled Inventory," which most wholesale sellers avoid for good reason), every unit needs its own FNSKU label. The FNSKU label has to fully cover the manufacturer's barcode. If Amazon's scanner picks up the UPC instead of your FNSKU, your unit can get commingled with someone else's inventory of the same product. If that other seller's stock has a quality problem, you can end up with returns and complaints for units you never touched.

Apply the FNSKU label to a flat, smooth surface so the barcode remains fully scannable. Don't place labels over safety warnings, ingredients, instructions, or other required product information. Use high-quality, clearly printed labels to avoid unreadable barcode errors. If you're shipping inventory regularly, consider using a dedicated label printer for more consistent print quality.

Amazon FBA Packaging Requirements

Amazon's packaging requirements vary by product type, so it's important to know which standards apply before sending inventory to a fulfillment center.

Poly Bags

• Use poly bags for products with loose parts, soft goods, or packaging that isn't durable enough for handling.
• Poly bags with an opening of 5 inches or more must include Amazon-compliant suffocation warnings.
• Choose bags that fit properly without stretching tightly around the product.
• Seal bags securely to prevent products from slipping out during transit.

Suffocation Warnings

• Poly bags with openings of 5 inches or more require a printed or attached suffocation warning.
• The warning must be clear, legible, and meet Amazon's size requirements.
• Pre-printed poly bags help reduce labeling errors and simplify prep.

Bubble Wrap

• Bubble wrap fragile items such as glass, ceramics, and products that can crack, chip, or dent.
• Wrap products well enough to prevent movement inside the shipping carton.
• Ensure products can withstand normal handling throughout Amazon's fulfillment network.
• Use enough cushioning to prevent contact with other hard surfaces during transit.

Bundled Products

• Secure all items so they remain together as a single unit.
• Use shrink wrap, a bundle box, or a poly bag to keep components together.
• Apply the FNSKU label to the outside of the completed bundle.
• Clearly identify the bundle as a single product before shipping.

Amazon Inventory and Shipping Requirements

Before inventory is sent to an Amazon fulfillment center, sellers also need to meet Amazon's shipment requirements.

Expiration Dates

• Products with a limited shelf life, including food, supplements, cosmetics, and some batteries, must meet Amazon's expiration date requirements.
• Inventory must have the minimum remaining shelf life required for its product category when it arrives at an Amazon fulfillment center.
• Expiration dates must be clearly printed and visible on the product or packaging.
• Where required, expiration dates must also be entered during shipment creation in Seller Central.

Always check Amazon's category-specific shelf-life requirements before purchasing close-dated inventory, as products that don't meet the minimum may be rejected.

Case-Packed vs. Individual Units

Amazon allows inventory to be shipped as case-packed cartons or as individually prepared units, depending on the products and how they're packaged.

• Case-packed shipments are unopened manufacturer cartons containing identical products in the same quantity. They can speed up receiving but only qualify if they meet Amazon's case-pack requirements.
• Individual units require each product to be labeled and prepared separately before shipping. This is the most common option for sellers using FNSKU labels, as every unit needs to be individually identified before entering Amazon's fulfillment network.

Shipping Labels and Box Requirements

Every shipping carton must display the Amazon shipment label generated in Seller Central after the shipment is created. Additional box requirements include:

• Apply the shipment label to the correct side of the carton and keep it fully visible.
• Remove or completely cover old shipping labels, barcodes, and markings if reusing boxes.
• Use sturdy cartons that can withstand stacking and normal transportation.
• Stay within Amazon's maximum box weight limits for your shipment type.
• Make sure boxes are securely sealed before they enter the shipping network.

Pallet Requirements

Large freight shipments may need to be shipped on pallets instead of individual cartons.

• Stack cartons securely to prevent movement during transit.
• Shrink-wrap pallets to keep shipments stable.
• Stay within Amazon's pallet height and weight limits.
• Apply pallet labels according to Amazon's freight shipping requirements.

Review Amazon's pallet guidelines before booking freight shipments, as pallet requirements differ from standard parcel shipments.

What Happens When Amazon Rejects Inventory

Before 2026, a few things could happen depending on the severity. Minor issues, like a slightly damaged label or a box that needed restacking, often got corrected by Amazon's receiving team for an unplanned prep fee. That option is off the table now.

The financial hit isn't usually the labeling fee itself, which is often just a dollar or two per unit. It's the delay. A shipment sitting in a receiving exception queue can take one to two weeks longer to become sellable, and if that inventory was your first order of a product you were hoping to get selling quickly, that delay eats directly into your cash flow timeline.

Common Prep Mistakes I Still See

Prepping inventory correctly isn't new. Sellers have been bagging, labeling, and boxing their own products for years, long before Amazon stopped offering its own prep service as a backup. These are the same errors I've watched trip up sellers for years, and now that there's no safety net catching them, they matter more.

• Labeling over the wrong barcode. The FNSKU has to cover the manufacturer's UPC completely. A corner peeking out is enough to cause a scanning mismatch.
• Underestimating poly bag sizing. Bags that are too tight split. Bags that are too loose don't protect the product properly and can trigger a suffocation warning requirement you didn't account for.
• Skipping the suffocation warning on bags with openings 5 inches or larger. This one is a hard compliance rule, not a judgment call.
• Not checking variation-level barcodes. If you're prepping a product that comes in multiple sizes or colors, make sure every physical unit gets matched to its correct FNSKU. Mixing up variations at the labeling stage creates a mess that's genuinely painful to untangle after the fact.
• Reusing boxes without removing old labels. Covered above, but it's common enough to repeat.
• Assuming retail packaging is good enough. Retail packaging is designed to look good on a store shelf, not to survive a fulfillment center's handling process. They're different jobs, and retail packaging failing that second job is one of the most common causes of damaged-in-transit claims.

Amazon FBA Prep Industry Trends for 2026

While Amazon's core prep requirements remain largely the same, the way sellers manage FBA prep continues to evolve. Here are the biggest trends shaping Amazon FBA in 2026:

• Third-party prep centers are becoming the norm. Since Amazon ended its in-house prep and labeling services, more sellers are outsourcing prep to specialized providers.
• Automation is improving prep accuracy. Many prep centers now use barcode scanning and automated labeling systems to reduce errors and speed up processing.
• Packaging is becoming more sustainable. More sellers and prep providers are adopting recyclable packaging materials where they meet Amazon's requirements.
• Prep mistakes are more costly. Without Amazon's prep service as a fallback, issues like incorrect labels, missing suffocation warnings, and packaging errors are more likely to delay or reject shipments.

A Practical Prep Checklist Before You Ship

Run through this before any shipment goes out the door.

Where Prep Fits into the Bigger Picture

Prep is a small piece of running an Amazon wholesale business, but it's one of the few pieces that's entirely within your control. Getting this one piece right consistently removes an entire category of delays and fees from your business, and it's the kind of thing that stops taking any real thought once you've built the habit.

If you're still working out the earlier steps, like finding your first suppliers or understanding whether wholesale is the right model for you, prep is worth having on your radar even before your first order arrives. It's a lot easier to build the right process from the start than to fix a bad one after a few rejected shipments.

A lot of beginners get to this point, understand the requirements, and still feel unsure the first time they're standing in front of a real shipment with real money on the line. That's normal. If you want someone reviewing your actual shipments, suppliers, and inventory decisions before you spend money on them, that's what my 1:1 mentorship is built for. If you're not ready for that yet, the free minicourse is a good place to see how the whole process fits together before committing to anything.