Overview

Amazon requires sellers to include specific product measurement attributes — including item form, unit count type, net content, and number of items — on their listings across hundreds of product types. These mandatory fields, which took effect in July 2021, are designed to standardize how quantity and size information appears in search results and product pages, helping customers compare products more easily.

Key Points / What Sellers Need to Know

• Three mandatory attribute sets were introduced — Item form, number of items, and net content details became required across a wide range of product types, affecting both new and existing listings.
• Unit count type is conditionally determined — The unit count type value is automatically derived based on the item form selected during listing creation for 138 product types, meaning sellers must choose the correct item form first.
• Hundreds of product types are affected — The changes impact product types across categories including health and beauty, grocery, household supplies, baby products, and more.
• Non-compliance risks search suppression — ASINs created after the effective date that lack these required attributes may be removed from search results until the missing data is provided.
• Existing listings need updating — Sellers with offers on affected ASINs must retroactively add the required attribute data to maintain visibility.

How the Attribute System Works

Amazon's attribute requirements vary by product type and fall into several groups. Eight product types received the full new attribute set including item form, number of items, and net content. An additional 86 product types now require the number of items field, which was previously optional. For 154 product types, the net content attribute became mandatory. Finally, 138 product types have a conditional unit count type that is automatically populated based on the item form the seller selects. For example, if a product belongs to the coffee product type and the item form is liquid, the unit count type would be set to fluid ounces. Sellers should consult Amazon's published lists of valid net content values and unit count type values to ensure they select the correct measurements for their products.