When the goods arrive at Amazon’s fulfillment centers, the FBA labels are used to identify the sellers. The labels must be printed and applied correctly. According to Amazon, the dimensions must be between 1 x 2 and 2 x 3 inches (1 x 3 inches or 2 x 2 inches)
Make sure there is at least a 0.25-inch space between the edge of the package and the FBA box label before attaching the label.
