Shipping Container Sizes, Loading, and Drayage Explained

Most ecommerce and B2B inventory crosses an ocean at some point, packed inside a steel shipping container. Picking the right container size, loading it the right way, and getting it from the port to the warehouse on time all directly affect how fast your goods reach customers.

What are the standard shipping container sizes?

International freight uses a handful of standard intermodal container sizes. The ones that matter most for ecommerce inbound:

20-foot dry container

External dimensions roughly 20 ft long, 8 ft wide, 8.5 ft tall. Internal capacity is about 1,170 cubic feet and a maximum payload around 47,000 lbs. Common for smaller-volume inbound or heavy, dense products.

40-foot dry container

Roughly twice the length of a 20-foot at the same width and height. Internal capacity is about 2,390 cubic feet, payload around 59,000 lbs. The workhorse of ocean freight.

40-foot high cube (40' HC)

Same footprint as a 40-foot but a foot taller, giving about 2,700 cubic feet of internal volume. The same maximum payload as a standard 40, but more usable space for low-density freight. Often the right pick when your goods cube out before they weight out.

45-foot high cube (45' HC)

A longer, taller variant used when volume matters more than weight. About 3,040 cubic feet of capacity. Less common at smaller ports.

There are also reefer (refrigerated) and specialty containers, but the four above cover almost all dry-goods inbound.

How should you load a shipping container?

There are two main loading approaches. The choice drives receiving cost and speed at the destination warehouse.

Floor-loaded containers

Cartons are stacked directly on the container floor, packed tight from front to back. It maximizes cubic utilization (more cartons fit) and reduces packaging cost upfront. The downside is the receiving labor: cartons have to be unloaded one by one, by hand or with a roller conveyor.

Palletized containers

Goods arrive on pallets, stacked inside the container. Fewer cartons fit because pallets take up vertical and horizontal space, but the unload is dramatically faster — a forklift moves a whole pallet in seconds. Receiving labor drops and put-away is cleaner.

The right call usually comes down to math: if your goods are high-volume and the cube savings on floor-loaded outweigh the higher receiving fee, floor-load. If your volumes support the pallet cost and you want faster put-away, palletize at origin.

What is drayage?

Drayage is the short-haul truck move that brings a container from the port to the warehouse (or back). It is its own industry — drayage carriers specialize in port pickup, container yard handling, chassis management, and short-distance trucking.

Drayage rates are billed separately from ocean freight. A typical drayage charge bundles:

Port pickup fee

Trucking from the port to the warehouse

Chassis rental (the wheeled frame that carries the container)

Fuel surcharge

Wait time at the warehouse if unloading runs long

Demurrage and detention charges live next to drayage on the invoice and pile up fast when a container sits at the port or at the warehouse longer than the free time allowed.

Why does real-time container tracking matter?

Containers move through many handoffs: ocean carrier, terminal, drayage trucker, warehouse dock. Each handoff is a potential delay point. Without visibility, a brand finds out their inbound is late after it is already late.

Real-time tracking ties all those handoffs together on one screen. The brand sees the vessel ETA, terminal arrival, container availability, drayage pickup, and warehouse arrival as each event happens. That lets the brand plan inventory commitments, customer ETAs, and downstream marketing against the actual inbound timeline.

How 3PL Center handles shipping containers

Container receiving is one of the operations we run every day for ecommerce and B2B clients:

Live container tracking from vessel ETA through terminal release, drayage pickup, and warehouse arrival, visible on your portal at every step of the journey.

Floor-loaded and palletized inbound handled the same workflow, with the right receiving labor allocated based on the load type.

Advanced appointment system that eliminates per-diem and demurrage exposure where possible.

Pallet-level barcode tracking once goods are put away, on-hand and in-transit visible on the portal.

Inbound put-away within standard 24-48 hour receiving windows on clean containers.

99.9% fulfillment accuracy across what we ship out.