Stuffing

Stuffing is the process of loading cargo into a shipping container before transport. The term is standard industry language used by freight forwarders, warehouses, and ocean carriers worldwide. The reverse operation, removing cargo from a container, is called destuffing or stripping. Both processes happen thousands of times daily at ports, warehouses, container freight stations, and factory loading docks across every major trade lane.

Where Stuffing Takes Place

Cargo can be stuffed at the origin factory, at a consolidation warehouse, at a Container Freight Station (CFS), or at the shipper’s own facility. The choice of stuffing location depends on the shipment type. Full Container Load (FCL) shipments are typically stuffed at the factory or shipper’s warehouse because one party controls the entire container. Less-than-Container Load (LCL) shipments are stuffed at a CFS, where a consolidator combines cargo from multiple shippers into a single container.

For Amazon sellers importing from China, stuffing usually happens at the supplier’s factory. The supplier loads cartons onto pallets or directly floor-loads them into the container, the container is sealed, and a truck moves it to the origin port for vessel loading. Sellers shipping from a domestic warehouse to Amazon FBA fulfillment centers may also stuff containers or trailers as part of outbound logistics.

Stuffing Methods and Load Planning

How cargo is arranged inside a container affects everything from freight cost to damage risk. The two primary loading approaches are palletized loading and floor loading. Palletized cargo is stacked on standard 40×48-inch or 48×48-inch pallets, shrink-wrapped, and loaded with a forklift. This method speeds up unloading at the destination but sacrifices some container volume because pallet dimensions do not perfectly match container interior widths. A standard 40-foot high-cube container can hold roughly 20 to 22 standard pallets in a single layer.

Floor loading (also called hand loading or loose loading) stacks individual cartons directly on the container floor without pallets. This maximizes cubic utilization. A floor-loaded 40-foot container can hold 15% to 25% more cartons than the same container loaded on pallets. The trade-off is that unloading takes significantly longer and typically requires manual labor rather than a forklift. For FBA prep operations receiving floor-loaded containers, the unloading process for a full container can take a crew of three to four workers several hours compared to under an hour for a palletized load.

Weight Distribution and Securing Cargo

Improper weight distribution during stuffing is one of the most common causes of container damage and cargo loss. The International Maritime Organization (IMO) and the CTU Code (Code of Practice for Packing of Cargo Transport Units) provide guidelines for distributing weight evenly across the container floor. Heavy items should be placed on the bottom, centered over the container’s structural supports. Placing excessive weight at one end can cause the container to become unbalanced on the chassis, creating a safety hazard during road transport and vessel stowage.

Cargo should be braced to prevent shifting during transit. Airbags (dunnage bags), foam blocks, wood bracing, and strapping are all used to fill voids between cargo and container walls. Ocean containers experience dynamic forces during a voyage, including rolling, pitching, and racking. Cargo that shifts during transit can collapse, puncture packaging, or cause the container to become top-heavy.

Stuffing for FBA Shipments

Amazon’s fulfillment centers have specific receiving requirements that affect how containers should be stuffed at origin. Palletized shipments must meet Amazon’s pallet specifications: 40×48 inches, no taller than 72 inches including the pallet, and no heavier than 1,500 pounds per pallet. Prep centers like MeisterPrep that receive ocean containers and then reship to FBA often prefer palletized loads because they can be unloaded quickly, inspected, labeled, and re-palletized to Amazon’s specs with less handling.

Getting the stuffing right at origin saves time, reduces damage claims, and keeps the supply chain moving on schedule from factory to fulfillment center.