Amazon FBA poly bag requirements, explained
If Amazon flags your inbound shipment for a bagging problem, it's almost never a surprise — the rules are short, stable in outline, and easy to meet once you know what the bag itself has to do. This is part of our guide to packaging requirements by sales channel.
THE SHORT ANSWER
A compliant Amazon FBA poly bag is transparent, thick enough to resist tearing, fully sealed, and shows a scannable barcode — and if its opening is large enough, it carries a suffocation warning. The exact thickness, warning wording, and warning text sizes are published by Amazon and can change, so treat the numbers below as the well-established shape of the rule and confirm the current version in Seller Central before you print. The core requirements:
- Transparent — so the unit and its barcode are visible without opening the bag
- Minimum thickness — a bag gauge (in mil) that resists puncture in transit
- Fully sealed — closed so it can't be reopened without visibly damaging the seal
- Scannable barcode — the FNSKU reads through the bag or on a label on the outside
- Suffocation warning — required once the bag opening reaches the published threshold (commonly 5 inches or more)
Requirements and fees change. This page was last verified against Amazon Seller Central on 18 July 2026. Always confirm the current version in Amazon Seller Central before you rely on it. This is general guidance, not legal or compliance advice.
What Amazon expects of a poly-bagged unit
Amazon won't accept loose, exposed product into a fulfillment center. When a unit needs a bag — because its contents are exposed, it's a soft good, or several pieces are sold as one unit — the bag itself has to satisfy a short list of requirements. The list is commonly published and stable in its outline; the precise measurements sit inside Seller Central and are the only version that governs. Here's the shape of it.
| Requirement | What it generally means | Where to verify the current spec |
|---|---|---|
| Transparency | The bag is clear, so the unit and its barcode are visible without opening it. | Amazon Seller Central |
| Minimum thickness | Amazon sets a minimum bag gauge (in mil) so the bag resists tearing and puncture in handling. | Amazon Seller Central |
| Fully sealed | The bag is closed so it can't be opened without visibly damaging the seal. | Amazon Seller Central |
| Scannable barcode | The FNSKU (or an Amazon-accepted barcode) scans without opening the bag. | Amazon Seller Central |
| Suffocation warning | Required once the bag's opening reaches a threshold size — commonly published as 5 inches or more. | Amazon Seller Central · U.S. CPSC |
None of these are exotic. The two that trip sellers up most are the thickness (people reuse whatever polybag they have on hand) and the suffocation warning (people forget it, or print it too small for the bag). Both are covered below, and both point back to the current Seller Central spec for the exact number.
The suffocation warning and the 5-inch rule
A suffocation warning is generally required once a bag's opening is large enough to fit over a child's head. The widely-published threshold is an opening of 5 inches or more — measured flat across the opening. Treat that as the commonly-published rule and confirm the current figure against Seller Central, since the exact threshold and the required wording are Amazon's to set.
The warning text itself is a near-industry-standard block that begins along the lines of "To avoid danger of suffocation, keep this plastic bag away from babies and children." Present that as the common standard rather than the exact required string: verify the precise wording Amazon (and, for the underlying safety rationale, the U.S. CPSC) expects. Warning text size generally scales with bag size — the larger the bag, the larger the required type — and Amazon publishes a tiered table for that. Do not guess the point sizes; read them off the current Seller Central table. Our dedicated guide to suffocation warning label requirements walks through the wording, the tiers, and how to print it.
Thickness, transparency, and sealing
Three physical properties of the bag do the work here.
- Thickness. Amazon publishes a minimum bag gauge in mil. Rather than memorize a number that can move, match your bag to Amazon's stated minimum and confirm it in the current guidance. A practical note from the manufacturing side: a bag that only just clears the minimum will still puncture on a sharp corner, so the minimum is a floor, not a target — size the gauge to the product, not just the rule.
- Transparency. The bag has to be clear enough that the unit and its barcode can be inspected and scanned without opening it. Opaque, tinted, or heavily printed bags defeat that unless a barcode label is applied on the outside.
- Sealing. The bag must be sealed so it can't be reopened without visibly damaging the seal. A simple zip-top or a folded-over flap doesn't always satisfy that, because it reopens cleanly. When a resealable feature is needed for the shopper, pair it with a permanent seal or tamper-evident closure so the inbound requirement is still met.
The barcode: scannable through the bag or on the outside
Every unit needs exactly one scannable barcode that a fulfillment center can read — typically the FNSKU, or a manufacturer barcode Amazon accepts. The rule is simple to state: it must be scannable without opening the bag. That gives you two clean options. Use a transparent bag and let the existing on-product barcode read through it, or apply a barcode label to the outside of the bag. If the bag is opaque, or the product's own code ends up hidden by a fold or a seal, put the label on the outside. And make sure only one scannable code is visible — cover any other barcodes so the FC scanner isn't reading the wrong one.
Face stock — the printable top film or paper of a pressure-sensitive label (the layer above the adhesive and liner). Your barcode label and any separately-applied suffocation warning are printed on a face stock chosen for the surface and conditions. See more terms in the packaging glossary.
Is a poly bag even the right prep?
Not every FBA unit needs a bag. A sturdy retail box that's already sealed and carries a scannable barcode often ships as-is. Bagging is the prep for units whose contents are exposed, could shed or collect dust, could be damaged by liquid, or are sold as a multi-piece set that has to stay together. Soft goods like apparel almost always get bagged. Before you bag anything, confirm your product type's prep in Seller Central, because the product-type list is what actually governs. A quick way to sanity-check a unit:
- Does the product type require bagging? Check Amazon's prep guidance for your category first.
- Is the barcode scannable as-is? If not, a clear bag plus an outside label solves it.
- Is the opening 5 inches or more? If so, plan for the suffocation warning (verify the threshold).
- Will it survive transit? If a bag alone won't protect it, box or bubble it instead of over-relying on the bag.
- Is it sealed so it can't reopen cleanly? If not, add a permanent or tamper-evident seal.
The full inbound sequence — bag, seal, warn, label, box, and box limits — lives in the Amazon FBA prep checklist, and you can run a specific unit through the free FBA prep checker to see which steps apply.
A poly bag is a flexible-packaging spec
It's easy to treat the poly bag as an afterthought you buy in a case from an office supplier. But once you're bagging at volume, the bag is a real flexible-packaging decision: the film type and gauge, the seal method, the transparency, and — if you print the warning or the barcode onto it — an actual print and label-material spec. Choosing the right film and adhesive matters the same way it does on any label: a printed warning or barcode has to stay legible and stuck for the whole trip, which is a face-stock and adhesive question, not a wishful one. Getting the bag spec right up front is cheaper than a rejected inbound shipment and a re-prep.
How PackOS quotes your bagged units
PackOS treats the bag, the printed warning, and the barcode label as what they are — a flexible-packaging and label job it can spec and price. Upload your artwork or a specification and it detects the structure, reads the dimensions, and produces an instant quote for the bag and any applied labels, so you're not guessing at film, gauge, or print. You can see how the detection and quoting work on the technology page, run a unit through the free FBA prep checker, or price a real bag now with Quick Quote. Whatever the number turns out to be, confirm the compliance details against Seller Central before you commit to a run.
Frequently asked questions
Do all Amazon FBA units need to be in a poly bag?
No. Poly bagging is required for specific situations — units with contents that are exposed, items that could be damaged by dust or liquid, soft goods like apparel, and multiple pieces sold as one unit. Many products ship in their own sealed retail box without a poly bag. Amazon lists which product types require bagging in Seller Central, and that list is what governs, so confirm your category there before you prep.
What thickness does an Amazon poly bag have to be?
Amazon specifies a minimum poly bag thickness in mil and publishes the current figure in Seller Central. Rather than rely on a number that can change, match your bag to Amazon's stated minimum and confirm it in the current Seller Central guidance. A thicker bag also resists punctures better in transit, so treat the minimum as a floor rather than a target.
When does a poly bag need a suffocation warning?
A suffocation warning is generally required once the bag's opening reaches a certain size — commonly published as an opening of five inches or more, measured flat across the opening. The exact threshold and the required warning wording live in Amazon Seller Central and can change, so verify the current rule there. Larger bags typically require larger warning text.
Does the barcode have to show through the poly bag?
The unit's scannable barcode — the FNSKU or a manufacturer barcode Amazon accepts — must be scannable without opening the bag. That means either a transparent bag the existing barcode reads through, or a barcode label applied to the outside of the bag. If the bag is opaque or the code is hidden, apply a label on the outside, and cover any other barcodes so only one is scannable. Confirm the current barcode rules in Seller Central.
Can I use a resealable or zip-top poly bag for FBA?
A resealable bag can be acceptable, but Amazon generally requires the bag be sealed so it cannot be opened without visibly damaging the seal, which a simple zip-top does not always satisfy. Check Amazon's current sealing requirement in Seller Central. When you need a resealable feature for the shopper, pair it with a permanent seal or tamper-evident closure so the inbound requirement is still met.