Amazon FBA Prep: The Complete Guide for Sellers

Amazon FBA (Fulfillment by Amazon) is the backbone of most successful Amazon seller businesses. You ship your inventory to Amazon's warehouses, and they handle picking, packing, and shipping to customers. Sounds simple — until you get hit with prep fees, storage overages, or rejected shipments.

FBA prep requirements are strict. Every unit needs a scannable barcode (FNSKU). Poly-bagged items need suffocation warnings. Fragile items need bubble wrap. Sets must be clearly labeled. Miss any of these, and Amazon rejects your shipment — costing you time, money, and sales rank.

The smartest Amazon sellers use a 3PL (third-party logistics) provider for FBA prep. Your goods ship from the factory to the 3PL warehouse. The 3PL inspects, labels, preps, and creates the FBA shipping plan. Clean, compliant inventory arrives at Amazon ready to sell.

Inventory timing is everything. Send too much to FBA and you're paying long-term storage fees ($6.90/cubic foot per month). Send too little and you stock out, killing your ranking. The sweet spot is 6-8 weeks of inventory at any time, with replenishment shipments timed to your sell-through rate.

Lumen SCOS integrates directly with Amazon's Selling Partner API. Your FBA orders sync automatically, inventory levels are tracked across your warehouse and Amazon's fulfillment centers, and shipment confirmations flow back to Amazon when you dispatch. It's the operations layer between your factory and Amazon's front door.