Urgent: Fill in package size by Apr 30, or extra shipping fees apply.

Amazon's latest FBA policy update: All sellers must complete product packaging dimension certification by April 30, 2026. Failure to submit the required information on time may result in additional logistics processing fees and even affect product warehousing and listing.

I. Core of the New Regulation: What is "Package Size Certification"?

Simply put, Amazon requires you to accurately fill in the packaging dimensions (length, width and height) and weight of each product when creating a shipment.

These data are used for:

• Accurately calculated logistics delivery fees

• Optimize FBA warehouse storage space

• Provide more accurate customer shipping cost estimates

⚠️ If the data is missing or incorrect, Amazon will: 1. Re-measure your products and charge a "manual measurement fee"; 2. Charge fees based on the re-measured dimensions (usually higher); 3. Cause warehousing delays or even reject incoming shipments.

II. Why does Amazon do this?

In recent years, Amazon has continuously optimized its FBA fee structure with three core objectives:

First, fair pricing — align logistics fees with actual space occupancy and prevent sellers from overpaying for inflated package dimensions.

Second, efficiency improvement — it facilitates warehouse planning and automated processing, and accelerates goods turnover.

Third, cost control — reduce operational losses caused by dimensional errors and cut overall logistics costs.

Active size certification = Avoid fines + Access to potentially better rates.

III. Complete authentication in 4 steps (Recommended for bookmarking)

Step 1: Log in to the seller backend and go to "Inventory > Manage All Inventory".

Step 2: Select the products that need certification and click "Edit".

Step 3: Fill in the "Product Dimensions" column with the accurate length, width, height and weight of the package.

Step 4: Save the information, and the system will prompt that the authentication is successful.