Overview

Amazon's Fulfillment by Amazon (FBA) program includes an extra-large storage type designed to give sellers greater flexibility when managing inventory for their biggest products. This storage classification sits alongside the standard oversize category but operates through a separate fulfillment network, meaning sellers need to understand how their products are classified and what limits apply to plan inventory effectively.

Key Points / What Sellers Need to Know

• Extra-large and oversize are separate categories — Although both handle larger products, the extra-large and oversize storage types are distinct classifications with different size and weight thresholds. Orders for each category are fulfilled through separate networks.
• Automatic reclassification may apply — If you have existing oversize inventory that meets the extra-large criteria, Amazon will automatically reclassify it. No action is required on your part, but you should monitor your inventory dashboard for changes.
• Restock limits apply — Both individual and professional selling accounts may be subject to restock limits specifically for extra-large items, separate from limits on other storage types.
• Packaging requirements matter — Items in certain size ranges must meet ships-in-own-container (SIOC) packaging standards, meaning they must arrive at the fulfillment center in their original packaging and withstand delivery without additional over-boxing.
• Girth calculation is important — Amazon uses a specific girth formula: Girth = (median side + shortest side) x 2. This measurement, combined with length, determines how your product is classified.

Size and Weight Criteria

Amazon uses specific dimensional and weight thresholds to determine whether an item qualifies as extra-large versus oversize. For the extra-large classification, a product must meet any one of the following criteria: the longest side is 70 inches or greater; for TV packages, the longest side is 40 inches or greater; the girth plus length equals or exceeds 130 inches; or the unit weight is 50 pounds or more. The girth calculation follows the formula of (median side + shortest side) multiplied by two, then added to the length of the longest side.