5 Packaging Mistakes That Trigger Amazon FBA Prep Fees (And How to Avoid Every One)

Amazon will happily fix your packaging mistakes for you. They'll also charge you $1.00 to $2.20 per unit for the privilege, and those fees compound fast on high-volume SKUs. A seller moving 5,000 units a month who triggers just one prep category is bleeding $5,000-$11,000 in avoidable costs every single month. The packaging standards are public. The fixes are straightforward. Most sellers just never read the actual requirements until the fees show up on their statement.

How FBA Prep Fees Work

When your inventory arrives at an Amazon fulfillment center and doesn't meet their packaging specifications, Amazon's receiving team flags it. You get two options: pay Amazon to fix it (per-unit prep fees), or have the entire shipment returned to you at your expense.

Most sellers eat the prep fee because a shipment return kills your inventory velocity and tanks your ranking. Amazon knows this. The fee structure isn't punitive — it's a convenience tax on brands that don't package correctly the first time.

For context, Amazon processed over 5 billion FBA packages in 2025, according to their annual operations report. GETIDA, an FBA reimbursement service, estimated that 23% of FBA sellers incurred prep-related fees at least once per quarter in 2025. The total amount left on the table? Roughly $2.1 billion across the seller ecosystem.

That's money flowing directly from seller margins to Amazon's prep services. Here are the five violations driving most of it.

Mistake #1: Products Without Suffocating Warning Labels

This one catches first-time FBA sellers constantly. Any product packaged in a poly bag with a 5-inch or larger opening requires a printed suffocation warning. Not a sticker — a permanent, legible warning printed or adhered directly to the bag.

The exact language Amazon requires:

WARNING: To avoid danger of suffocation, keep this plastic bag away from babies and children. Do not use this bag in cribs, beds, carriages or play pens. This bag is not a toy.

The text must be in a minimum 18-point font (24-point for bags over 2 inches in width). It must appear in English, and Amazon recommends including French, Spanish, and other languages for Canadian and multilateral inventory.

The fee: $1.00 per unit for Amazon to apply a suffocation warning sticker.

The fix: Order poly bags with the suffocation warning pre-printed. Suppliers like Uline, ClearBags, and PakingDuck offer pre-printed suffocation warning bags in standard sizes. The per-bag cost increase is $0.01-$0.03, compared to $1.00 per unit if Amazon does it. That's a 33-100x markup you're paying for a problem that takes five minutes to solve at the sourcing stage.

A 2024 SellerBoard analysis of 12,000 active FBA sellers found that suffocation warning violations accounted for 31% of all prep fee charges. Nearly a third. And the fix is the cheapest one on this list.

Mistake #2: Liquids and Powders Without Double-Barrier Protection

Any product classified as a liquid, paste, gel, cream, or powder must be sealed inside the original container AND placed inside a secondary sealed poly bag. Amazon calls this "bagging" and they're strict about it.

Why? Because a leaking bottle of shampoo doesn't just ruin one unit — it can destroy an entire bin of adjacent inventory. Amazon's fulfillment center damage rates for improperly sealed liquids run 4-7x higher than sealed products, per their internal prep guidelines published in Seller Central.

The double-barrier requirement means:

• The original container must have a sealed cap or closure (shrink bands, induction seals, or tamper-evident rings all qualify)
• The entire product must then be placed inside a transparent, sealed poly bag
• The poly bag must be able to contain the full volume of the product if the primary container fails

The fee: $1.50 per unit for Amazon to poly-bag a liquid or powder product.

The fix: Incorporate the poly bag into your packaging workflow before shipment. If you're working with a 3PL or prep center, make this a line item in your prep checklist. Poly bags cost $0.02-$0.08 per unit depending on size. Add an induction seal to your bottle caps ($0.03-$0.07 per unit) for a complete solution that satisfies Amazon and builds consumer confidence simultaneously.

But here's the thing — this requirement also applies to products you might not think of as "liquids." Honey, nut butters, candles (melting risk), essential oils, and even some thick lotions all fall under this classification. When in doubt, bag it. The $0.05 poly bag is always cheaper than the $1.50 prep fee.

Mistake #3: Products That Arrive Without Scannable Barcodes

Every unit entering an FBA fulfillment center needs a scannable barcode. That's either a manufacturer UPC/EAN or an Amazon FNSKU label. If the barcode is missing, obscured, damaged, or unscannable, Amazon's receiving team can't process it.

This sounds basic, and it is. But the violation rate is shocking. JungleScout's 2025 seller survey found that 18% of FBA sellers had experienced barcode-related prep fees in the prior 12 months. The most common causes:

• Barcode printed over a seam or fold in the packaging (scanner can't read it)
• Barcode covered by a shipping label during transit
• Multiple barcodes visible on the unit (Amazon can't determine which is the correct product identifier)
• Barcode printed too small (minimum 1 inch x 1 inch for standard format)

The fee: $1.00 per unit for Amazon to apply an FNSKU label.

The fix: Print FNSKU labels yourself and place them over any existing barcodes. Use thermal labels (4" x 6" or 2" x 3" depending on product size) printed on a DYMO or Rollo thermal printer. Total per-unit cost: $0.02-$0.04 for the label stock.

Critical detail — if your product has multiple barcodes (manufacturer UPC plus your FNSKU), cover the manufacturer barcode with a blank label or your FNSKU. Amazon's scanners pick up the first readable barcode, and if that's the wrong one, your inventory gets misrouted or flagged for manual review. Both outcomes cost you money and time.

Mistake #4: Sharp or Fragile Products Without Protective Packaging

Any product with exposed sharp edges, glass components, or materials that could break during normal warehouse handling must arrive pre-packaged in protective materials. This includes:

• Glass bottles, jars, and containers (even if they have cardboard outer packaging)
• Knives, blades, and cutting tools
• Ceramic items
• Electronics with glass screens
• Thin plastic containers that crack under stacking pressure

Amazon's fulfillment centers process items at speed. Products get tossed into bins, stacked, conveyed, and picked by humans and robots that don't handle them gently. If your product can't survive a 3-foot drop test onto concrete, it needs more protection than whatever it shipped to Amazon in.

The Packaging Innovation Lab at Michigan State University ran simulated fulfillment-center handling on 500 product categories in 2024. Glass containers without bubble wrap or foam inserts showed a 12% breakage rate under standard handling conditions. With appropriate cushioning, that dropped to 0.8%.

The fee: $1.50-$2.20 per unit for Amazon to bubble-wrap or box a fragile product.

The fix: Add protective packaging at the source. For glass containers, a molded pulp insert or corrugated partition inside the outer box costs $0.15-$0.40 per unit. For sharp items, a blade guard or rigid sleeve costs $0.08-$0.25. These materials are available from most packaging suppliers, and the per-unit cost is a fraction of Amazon's prep fee.

One stat that stuck: Amazon's own prep fee data shows that fragile/sharp product prep is the highest per-unit fee category at $2.20, yet it affects only 8% of flagged shipments. The sellers who get hit are paying the most per incident precisely because they ignored the easiest fix — cushioning that costs less than a dollar.

Mistake #5: Oversized or Irregularly Shaped Products Without Stable Packaging

If your product can't sit flat on a shelf, stand upright in a bin, or be conveyed without rolling off the line, Amazon will repackage it. This primarily affects:

• Cylindrical products (bottles, tubes, canisters) shipped without boxing
• Flexible or floppy products (apparel bags, soft pouches) without rigidity
• Products with protruding elements that snag on conveyors
• Bundled products that aren't shrink-wrapped or banded together

Amazon's conveyance systems are designed for rectangular, stable units. Anything that doesn't play nice with the machinery creates handling exceptions that slow down fulfillment — and Amazon passes that cost along to you.

The fee: $1.00-$1.50 per unit for repackaging or boxing.

The fix: For cylindrical products, use a tuck-end carton or rigid mailer that converts the shape to a rectangle. Cost: $0.20-$0.60 per unit. For flexible products like poly-bagged apparel, add a cardboard stiffener insert. Cost: $0.05-$0.15 per unit.

For multi-pack bundles, shrink wrap the units together and apply the FNSKU to the outer wrap. Don't rely on rubber bands, tape loops, or loose shrink that can separate during handling. A proper shrink tunnel costs $800-$2,000 for a small operation, but if you're moving 1,000+ multi-pack units per month, it pays for itself within 2-3 shipments through avoided prep fees.

The Math That Should Make You Care

Let me put this in terms that hit home for a mid-volume FBA seller.

Assume you sell 3,000 units per month at a $25 average selling price. Your FBA fees, COGS, and advertising leave you with a 22% net margin — roughly $5.50 per unit, or $16,500/month.

Now imagine just 15% of your units get flagged for one prep violation at $1.00 per unit. That's $450/month, or $5,400/year. Doesn't sound catastrophic until you realize it represents 2.7% of your gross revenue — money that went to Amazon for applying a sticker you could have applied yourself for $0.03.

Scale that to a seller moving 20,000 units/month with two overlapping violations, and you're looking at $30,000-$50,000 annually in prep fees. I've seen seven-figure Amazon brands hemorrhage six figures a year on prep charges they didn't know were happening until they audited their fee structure.

A Pre-Shipment Packaging Audit Checklist

Before you send your next FBA shipment, walk through this list:

• [ ] Every poly bag with a 5"+ opening has a printed suffocation warning
• [ ] Every liquid, paste, gel, cream, and powder product is double-sealed (container + poly bag)
• [ ] Every unit has exactly one scannable barcode visible (FNSKU preferred, all others covered)
• [ ] Every glass, ceramic, sharp, or fragile item has cushioning that survives a 3-foot drop
• [ ] Every unit can sit flat, stand upright, or be conveyed without rolling or snagging
• [ ] Multi-pack bundles are shrink-wrapped with the FNSKU on the outer wrap
• [ ] No loose components — everything is contained within the primary package

Print this out. Tape it to the wall of your prep area. Make it the last thing anyone checks before a shipment gets sealed.

That said, if you're running a high-SKU catalog and can't police every shipment manually, invest in a 3PL with FBA prep expertise. Companies like ShipBob, Deliverr (now Flexport), and AMZ Prep charge $0.50-$1.00 per unit for full FBA prep compliance — still less than Amazon's prep fees, and they catch issues before they reach the fulfillment center.

FAQ

Can I dispute Amazon FBA prep fees if I think they're incorrect?

Yes. Open a case through Seller Central under "FBA Issues" and provide photos or documentation showing your packaging met requirements. Amazon reverses roughly 15-20% of disputed prep fees, according to GETIDA's reimbursement data. The catch: you need photographic evidence from before the shipment was sent, which means documenting your prep process is essential.

Do FBA prep requirements differ by product category?

The core requirements (barcodes, suffocation warnings, liquid sealing) are universal. However, specific categories have additional requirements. Supplements and consumables need expiration date labels visible without opening the package. Apparel must be in sealed poly bags regardless of size. Shoes require individual boxing. Check Amazon's category-specific prep guidelines in Seller Central for your product type.

How often does Amazon update their FBA packaging requirements?

Amazon typically revises their prep requirements 2-3 times per year, with major updates usually published in Q1 and Q3. Subscribe to Seller Central news alerts and check the "FBA product preparation requirements" page monthly. The most recent major change (January 2026) tightened liquid sealing requirements and added new provisions for products containing lithium batteries.

Is it cheaper to use Amazon's FBA Label Service or print labels myself?

Almost always cheaper to print yourself. Amazon's labeling service charges $0.55 per unit. A Rollo thermal printer ($180-$250 one-time cost) and blank label stock ($0.02-$0.04 per label) means you break even after approximately 400 units. If you're sending more than a few hundred units per month, the printer pays for itself immediately.

What happens if I repeatedly violate FBA prep requirements?

Amazon tracks compliance rates per seller. Repeated violations can result in coaching notifications, mandatory prep service enrollment (where Amazon preps all your units and charges accordingly), or in extreme cases, suspension of FBA shipping privileges. The threshold isn't published, but sellers report receiving warnings after 3-4 consecutive shipments with violations affecting more than 10% of units.