Overview

Error 100309 appears when a freight (heavy‑and‑bulky) shipping template is attached to a product that does not meet Amazon’s freight criteria. The mismatch blocks the listing from being created or updated, causing a sudden pause in visibility. Sellers need to correct the template assignment promptly to keep their catalog active and avoid lost sales.

Key Points

• Freight templates are exclusive — Only items that exceed Amazon’s size or weight thresholds may use heavy‑and‑bulky templates; standard‑size products trigger the error.
• Dimensions and weight are decisive — The system checks the actual measurements you entered; a 0.5 lb, 6 × 4 × 2 in. book will be rejected if a freight template is applied.
• Switch to a standard template — Resolving the issue requires reassigning the product to a regular (non‑freight) shipping group before resubmission.
• Listing submission halts — Until the template mismatch is fixed, Amazon will not accept the feed, preventing new listings or updates from going live.
• Bulk uploads amplify risk — A single incorrect column in a flat‑file upload can propagate the error across dozens of ASINs at once.

How to Resolve Error 100309

1. Verify product specifications — Open the affected listing in Seller Central and compare the entered weight and dimensions with Amazon’s freight eligibility limits (e.g., items over 150 lb or larger than 108 in. on any side). If a 12 × 8 × 4 in. kitchen gadget weighs 0.8 lb, it clearly fails the freight test.
2. Select the correct shipping template — Navigate to Settings → Shipping Settings, locate the shipping template currently assigned (often named “Freight – Heavy & Bulky”), and replace it with a standard template such as “Standard – Small Parcel”. For the kitchen gadget, choose a template that supports parcels under 70 lb.
3. Resubmit the listing — Save the changes, then either click Save and Finish on the product edit page or re‑upload the corrected flat file. Amazon will reprocess the feed; the error code disappears once the shipping group aligns with the product’s physical profile.