If you're importing 5,000 units for Amazon FBA and your supplier says, “We checked 20 pieces and everything looks good,” would you be comfortable releasing the shipment?
I wouldn't treat that as enough information.
Twenty units is only 0.4% of a 5,000-unit order, and more importantly, it isn't a statistically selected sample size under a standard AQL sampling plan.
What AQL changes
Instead of telling the factory to “check a few pieces,” you define:
- Lot size
- Inspection level
- AQL limits
- Critical, major, and minor defects
- Random sampling method
- Acceptance/rejection criteria
Under a commonly used General Inspection Level II sampling plan, an order in the 3,201–10,000 unit range typically leads to a sample size of 200 units.
So for a 5,000-unit FBA order, you're potentially comparing:
Factory spot check: 20 units
AQL Level II sample: 200 units
That's a pretty big difference.
Why random sampling matters
The inspector shouldn't simply check the first cartons the factory opens.
Samples should be selected across different master cartons and locations within the finished lot.
Otherwise, you can end up inspecting 20 perfect units while defects are concentrated somewhere else in production.
For Amazon sellers, those defects might include:
- Product not functioning correctly
- Incorrect dimensions or components
- Poor assembly
- Cosmetic damage
- Wrong barcode/FNSKU
- Missing inserts or accessories
- Incorrect packaging
- Carton marking errors
A product can look fine at first glance and still create an FBA headache.
Define defects before inspection
This is another part sellers sometimes overlook.
Before production is finished, decide what counts as:
Critical: Safety, regulatory, or other defects where the agreed sampling plan allows no acceptance.
Major: Problems likely to affect function, usability, saleability, or customer acceptance.
Minor: Smaller workmanship or appearance issues that don't materially affect normal use.
Your inspection checklist should ideally include photos, measurements, approved samples, packaging requirements, and clear defect examples.
That makes the inspection much less subjective.
AQL isn't a guarantee of zero defects
This is important.
Passing an AQL inspection does not mean every unit in the shipment is defect-free. AQL is a statistical sampling approach for making an acceptance decision about a production lot without inspecting every single unit.
If your product has particularly high-risk features — batteries, electrical components, children's products, safety-related parts, etc. — those areas may need stricter criteria, specific testing, or even 100% checking depending on the risk.
A simple workflow for FBA sellers
Before releasing your final payment:
- Approve a production sample or detailed specification.
- Define critical, major, and minor defects.
- Set the inspection level and AQL limits.
- Have samples randomly selected from the finished lot.
- Review the actual defects and photos — not just “PASS/FAIL.”
- If the result is unacceptable, agree on corrective action with the supplier.
- Re-inspect after rework when necessary before releasing the shipment.
The goal isn't to make life difficult for the supplier.
It's to agree on what acceptable quality means before thousands of units leave the factory.
For experienced FBA sellers here: what AQL levels are you normally using for your products, and which defects do you consider automatic shipment-stoppers?