Kitting vs Bundling for Amazon FBA 2026

Kitting vs. Bundling for Amazon FBA: 2026 Strategy and Fulfillment Guide

As of January 1, 2026, Amazon ended its FBA Prep Service and FBA Label Service in the US, including the Sold as set bagging it used to do, so every unit now has to arrive assembled, bagged and labeled by you or your 3PL. This change creates strategic opportunities for brands that leverage kitting and bundling effectively.

Kitting vs. Bundling: Key Differences

Bundling groups existing, individually sold SKUs under one listing to boost perceived value. The components stay available on their own ASINs, but the bundle itself has to ship sealed so it cannot be separated, labeled as a set, with a single scannable barcode.

That kind of bundle now has a deadline. Amazon announced on September 10, 2026 that from January 11, 2027 most product bundles listed as a single ASIN must be packaged by the original manufacturer or brand. A bundle assembled by a seller or a prep center stays allowed in three cases: with a letter of authorization from the brand owner or manufacturer of every brand inside it, uploaded through Account Health; in gifting browse nodes and camera product types; or as a Virtual Bundle, which brand owners and authorized resellers build in Amazon's tool without packaging the items together. Multi-brand bundles in Consumables also need those letters. A bundle that does not comply is deactivated and becomes a listing violation on your Account Health dashboard. Noncompliant inventory can still be sold before January 11.

Kitting assembles components, often not sold separately, into a new single SKU, which Amazon treats as a set: it needs warehouse labor, set labeling and its own GTIN to create the ASIN. This creates proprietary offerings competitors cannot easily replicate. If every component is your own brand, you are the brand doing the packaging. If the kit contains products of other brands, from January 11, 2027 it needs a letter of authorization from each of those brand owners, the same as any bundle.

Why the 2026 Policy Change Benefits Sellers

The service Amazon ended was bubble wrap, bagging and item labeling, never kit assembly. What a 3PL kit buys you is a product competitors have to replicate, not an ASIN Amazon reserves for you: brand differentiation and controlled presentation unavailable to checkbox competitors.

Business Advantages of Kitting

• One fulfillment fee per kit instead of one per component, as long as the assembled weight and dimensions do not push the kit into a larger size tier.
• A kit nobody else assembles is hard for other sellers to match, so in practice you are usually the only offer. Amazon grants no ASIN ownership: any seller can list on an ASIN, and Brand Registry is what gives you control.
• Higher AOV with premium pricing on curated solutions.
• Stronger brand positioning through intentional product design.

Technical Compliance Requirements

• A unique GTIN for each new kit, never a component barcode. If your brand is approved in Brand Registry and has no GTIN, apply for a GTIN exemption instead.
• "Sold as Set, Do Not Separate" labeling on multi-item kits.
• Suffocation warnings on any poly bag whose opening measures 5 inches or more when laid flat, printed on the bag or applied as a label, sized by the bag: 24 point at 60 inches of length plus width, down to 10 point under 29 inches.
• Single scannable outer package with master labeling.
• From January 11, 2027, a letter of authorization from the owner of every other brand inside the kit or bundle, unless it sits in a gifting browse node or a camera product type. Without it the listing is deactivated.

Non-compliance risks refusal or disposal at your expense with no reimbursement, plus account suspension risk, restricted selling privileges and loss of optimized placement.

Strategic Recommendations

Use Virtual Bundles for quick cart-size tests with existing inventory if you own the brand or are an authorized reseller: the items ship separately, so nothing is repackaged and the January 11, 2027 rule does not ask for a manufacturer configuration. Build a physical bundle of other brands' products only with their letters of authorization in hand, and sell through any noncompliant bundle before January 11, 2027. Deploy kitting for proprietary products under your own brand that cut costs and block competition. Growth sellers benefit from both across product lifecycles.

PrepVia Advantage

PrepVia provides compliant kitting services with unique GTIN assignment, set labeling, single-unit scanning prep, and full documentation for FBA receiving. Whether a multi-brand bundle can stay listed after January 11, 2027 depends on letters of authorization that only the brand owners can grant, so secure them before assembly.