Amazon Poly-Bagging Guide (2026)
Every Rule, Every Size, Full Compliance
Complete guide to Amazon FBA poly-bag requirements for 2026. Learn which products need poly-bags, thickness rules, suffocation warnings, sealing requirements, and label placement.
Which Products Require Poly-Bagging?
Amazon requires poly-bags for products that could spill, leak, contaminate other items, or be damaged by moisture or dust. This includes: apparel and clothing items, stuffed animals and soft toys, products with multiple loose pieces, items that could attract insects, fragile products prone to dust damage, and any liquid or semi-liquid products.
Poly-Bag Thickness Requirements
Amazon specifies minimum thickness based on bag size:
• Bags under 12" × 12": minimum 1.5 mil thickness
• Bags 12" × 12" or larger: minimum 2 mil thickness
Bags that don't meet thickness requirements will be rejected during FC induction and you'll be charged a prep fee.
Suffocation Warning Requirements
Any poly-bag with an opening of 5 inches or larger must display a suffocation warning. The warning must be permanently printed (not a stick-on label) and be visible and legible. Pre-printed bags are the easiest solution — purchase bags from FBA-compliant suppliers who include the warning in the manufacturing.
Sealing and Label Placement
All poly-bags must be sealed — either heat-sealed or secured with tape. The FNSKU barcode label must be applied to the outside of the sealed bag. Do not place the label inside the bag. The barcode must be fully scannable through the label surface, not through the bag material.
Common Poly-Bag Mistakes
The most frequent errors are: using bags that are too thin, missing suffocation warnings, placing FNSKU inside the bag, using unsealed open-top bags, and double-bagging when single is required. Each of these results in rejection or additional FC prep fees.
Let QuickShipment Handle This For You
Delaware tax advantage + 48-hour prep + 99.8% acceptance rate.
Get a Free Quote →Why This Got Stricter in 2026
Until the start of 2026, a unit that arrived at a fulfilment centre without a compliant bag could be bagged by Amazon and billed back to you. That safety net is gone: Amazon stopped prepping and labelling inbound US FBA units on sellers' behalf. A non-compliant bag is now a problem you fix, not a fee you absorb.
In practice that means the bag has to be right before the carton leaves your hands — or your prep centre's. It is the single change that moved poly-bagging from a detail to a gating requirement.
The Suffocation Warning Detail Nobody Publishes
Everyone repeats the rule: a bag with an opening of 5 inches or more, measured flat, needs a suffocation warning. Far fewer mention that the warning's print size scales with the bag. Amazon specifies a minimum font size based on the bag's combined length and width, rising in steps to 24 pt on the largest bags.
This is where cheap pre-printed bags fail. The warning is present, so it looks compliant, but it was printed at one size for every bag in the supplier's range. On the large sizes it is under-sized and rejectable.
Two other things about the warning:
- It must be permanently printed. A peel-off sticker does not satisfy the requirement, however neatly applied.
- It must stay legible. A warning printed on a bag that is then covered by the FNSKU label or a fold is the same as no warning.
Thickness, and What the Number Actually Protects
| Bag size | Minimum thickness |
|---|---|
| Under 12″ × 12″ | 1.5 mil |
| 12″ × 12″ and larger | 2 mil |
The thickness rule is not about the product; it is about the bag surviving handling without tearing and exposing contents. A 1 mil bag on a 14-inch apparel item will pass a visual check at your desk and split in a tote at the fulfilment centre.
Five Ways a Compliant Bag Still Fails
These are what we actually catch at receiving, in order of frequency:
- Sealed but not sealed flat. Trapped air pushes the FNSKU label into a curve and the scanner fails on it.
- Label applied over the seal or a fold. The barcode cracks along the crease during handling.
- Bag too large for the product. Excess material bunches, the label wrinkles, and the unit looks damaged on arrival.
- Warning covered. Usually by the FNSKU label placed without checking what is underneath.
- Right bag, wrong SKU. Mixed batches bagged in one session with no scan-verify step.
None of these are exotic. They are what happens when bagging is done by hand at volume without a check after the fact — which is why we scan every unit after the label goes on rather than trusting the application.
What It Costs to Get Right
Poly-bagging at our Claymont warehouse is $0.75 per unit, including the bag, sealing, label placement and the post-application scan. Compare that against the cost of a rejected shipment rather than against the cost of a bag: a batch turned back sits in Amazon's system for weeks while your listing loses velocity, and that is the expensive part.
If your supplier bags at source, we will still verify the sample — it is the cheapest insurance in the process.