Amazon’s “Frequently bought together” bundle appears after you’ve mentally committed to the main product, not before.

Post-decision, the brain is in “yes mode.” You’ve already said yes to the purchase. Additional items feel like enhancements, not new decisions. Showing bundles before the button risks overwhelming the primary choice.

A supplements brand moved their “Customers also bought” section from the sidebar to directly below the add-to-cart confirmation message.

Attachment rate increased 19%. Same suggestions, better timing.