Introduction
Amazon sellers in the U.S. now have new flexibility with packaging. As of 2025, the FBA carton limit has been bumped to 36 inches, replacing the older 25-inch maximum for inbound shipments. While Amazon Warehousing and Distribution (AWD) keeps the stricter 25×25×25 limits, the FBA change offers direct cost savings for sellers with long products or unusual dimensions.
This guide walks through what the new limit means, why it matters for cartonization and dimensional weight (DIM) charges, and how sellers should adjust their 3PL and prep processes. By the end, you’ll know how to rework your inbound shipping strategy to benefit from the FBA carton limit bump to 36 inches without making costly mistakes.
What Is the FBA Carton Limit Bump to 36 Inches?
The FBA carton limit bump to 36 inches means Amazon now accepts cartons up to 36 inches in length for inbound shipments into its U.S. fulfillment centers. Previously, the maximum carton length was 25 inches, which caused inefficiencies for certain SKUs.
Key Highlights
New Limit: 36 inches (length only).
Old Limit: 25 inches.
AWD Still Stricter: 25×25×25 remains the maximum for AWD shipments.
Impact: More flexibility for large or awkward products, fewer carton splits, and reduced DIM fees.
Amazon’s Seller Central FBA packaging guidelines confirm the updated rule for 2025.
Why the Change Matters for Sellers
This update directly affects how sellers package and ship inventory. For those working with long items such as sporting goods, home improvement tools, or kitchenware, the increase from 25 to 36 inches solves a long-standing challenge.
Benefits of the FBA Carton Limit Bump to 36 Inches
Fewer Splits: Long products no longer need to be broken into multiple cartons.
Lower DIM Charges: DIM weight is calculated by size; more efficient cartons mean lower fees.
Streamlined Cartonization: Better alignment between product dimensions and carton options.
Operational Savings: 3PLs can optimize pick-and-pack workflows with fewer adjustments.
By contrast, ignoring the change may leave sellers overpaying for shipping or failing to optimize cartonization.
AWD vs. FBA: What Hasn’t Changed
It’s important to note that AWD carton size requirements remain fixed at 25×25×25. This means sellers using both FBA and AWD must separate workflows.
| Program | Max Carton Size | Notes |
|---|---|---|
| FBA | 36″ length | Applies to inbound shipments only |
| AWD | 25×25×25 | No change in 2025 |
Sellers should not assume AWD adopted the FBA carton limit bump to 36 inches. Amazon makes clear in its AWD documentation that these restrictions remain in place.
Packaging Adjustments for the FBA Carton Limit Bump to 36 Inches
Adopting the new carton limit requires updates to packaging SOPs, especially if you use a 3PL or prep center.
Best Practices:
Audit Your Product Catalog: Identify SKUs that previously exceeded 25″ but fall under 36″.
Update SOPs with 3PLs: Ensure cartonization software and packaging rules align with the new max length.
Communicate with Carriers: Some carriers may adjust fees when using larger cartons.
Train Warehouse Staff: Avoid accidental AWD violations by clarifying program-specific carton rules.
The Role of DIM Weight in the 36-Inch Carton Limit
One of the biggest advantages of the FBA carton limit bump to 36 inches is reduced DIM charges. DIM (dimensional) weight calculates shipping fees based on package size, not just weight.
Example:
Old limit (25″): Two smaller cartons required, each billed separately.
New limit (36″): One carton allowed, lowering both carton count and dimensional charges.
Amazon explains DIM billing in its FBA fees and rate cards. Sellers should cross-check how DIM applies to their specific products after adopting new carton strategies.
First Steps for Sellers After the FBA Carton Limit Update
Review SKUs impacted by the new limit.
Coordinate with 3PLs and suppliers to update cartonization.
Run shipping simulations to compare DIM costs under old vs. new cartons.
Monitor stranded inventory reports to ensure packaging aligns with FBA acceptance rules.
Common Pitfalls to Avoid
Many sellers will welcome the FBA carton limit bump to 36 inches, but may run into new issues:
Mixing FBA and AWD rules: Accidentally shipping 36″ cartons into AWD centers could lead to rejections.
Failing to re-train staff: If teams continue using old SOPs, cartons may default to the outdated 25″ rule.
Ignoring account health impacts: Repeated non-compliance with carton limits may lead to performance flags under Amazon’s Account Health Rating program.
Preventive Measures: How to Stay Compliant
Maintain separate packaging SOPs for FBA and AWD.
Schedule quarterly compliance audits on packaging and cartonization.
Store training documentation for staff in a shared knowledge base.
Use Amazon’s Packaging Support resources for guidance.
How Legal Support Fits Into the Carton Policy Update
While packaging changes may not seem like a legal issue, non-compliance can result in stranded inventory, storage fees, or even shipment suspensions. If repeated errors escalate into account health violations, sellers may need to escalate with the help of an Amazon Seller Lawyer or Amazon Seller Attorney.
Do you need help? Submit your case now!
FAQs: FBA Carton Limit Bump to 36 Inches
Does the new limit apply to all FBA shipments?
Yes, but only for U.S. inbound shipments. AWD remains restricted at 25×25×25.
Will DIM charges always be lower?
Not always. While fewer cartons can reduce DIM charges, very large cartons may still trigger higher fees. Always calculate before shipping.
Can I use the 36″ limit for oversized items?
Yes, as long as the carton falls under the weight and dimension thresholds for oversized FBA shipments.
Does this affect palletization rules?
No, pallet requirements remain unchanged. Sellers must still follow Amazon’s pallet guidelines.
Conclusion
The FBA carton limit bump to 36 inches is one of the most seller-friendly policy updates in 2025. It reduces costs, simplifies cartonization, and helps sellers of longer products compete more effectively.
However, the benefits only apply when sellers update SOPs, train teams, and maintain a clear separation between FBA and AWD rules. Those who fail to adapt risk non-compliance, added costs, or account health penalties.
By staying informed, adjusting packaging processes, and seeking legal support when necessary, sellers can make the most of the new policy and protect their Amazon operations in 2025 and beyond.
