Many ecommerce sellers lose profit on multi item orders because Amazon FBA applies fees too aggressively as unit counts rise. This article explains how pick and pack fulfillment services help sellers lower incremental fulfillment costs, consolidate shipments, and protect margins on 2 plus unit orders. It also breaks down the secret math behind lower add on picks, dimensional weight advantages, and smarter channel routing across Amazon, Shopify, and TikTok. If you want better control over cost per order, this is where to start.