Most shippers pick a container size based on ocean freight math alone — then discover the choice ripples through every mile of the dray. Chassis availability, legal weight, storage footprint, and transload economics all shift with the box. Here’s the drayage-side view of the three standard sizes we haul daily at Go Drayage.

The quick comparison

20ft standard (TEU)

• Cubic capacity: ~1,170 cu ft
• Typical max payload: ~47,000–48,000 lb (but road limits usually bind first)
• Drayage reality: the density box. Tile, metals, machinery, beverages — 20-footers routinely hit overweight territory for U.S. highways long before they cube out.

40ft standard / high cube (FEU)

• Cubic capacity: ~2,390 cu ft (standard) / ~2,700 cu ft (high cube)
• Typical max payload: ~59,000 lb by container rating — far more than a legal road load
• Drayage reality: the workhorse. Most import freight cubes out before it weighs out, making the 40 the default for furniture, apparel, e-commerce goods, and mixed SKUs.

45ft high cube

• Cubic capacity: ~3,040 cu ft
• Typical max payload: similar to the 40ft
• Drayage reality: maximum cube for light, bulky freight. Fewer chassis fit it, and not every yard or dock is set up for the extra length — confirm equipment before booking.

Weight: the constraint that surprises importers

A container’s rated payload means little on U.S. roads. A standard five-axle tractor + chassis + container combination is generally limited to 80,000 lb gross, which works out to roughly 43,000–44,000 lb of cargo in a 40ft and 38,000–39,000 lb in a 20ft on standard equipment.

Load heavier than that and you need a tri-axle chassis and possibly overweight permits — a specialty of our heavy hauling team. Tell your drayage carrier the verified gross weight before dispatch; discovering an overweight box at the terminal gate wastes a move and a day.

How size changes the drayage plan

Chassis matching

Twenty-footers ride on 20ft or extendable chassis; 40s and 45s need their lengths. In tight equipment weeks, the wrong assumption strands a container. Asset-based carriers with steady chassis access — core to our container drayage service — de-risk this step.

Yard storage footprint

Bigger boxes eat more ground. Our 5-acre Miami yard stages over 450 containers of all three sizes, but if you’re planning long-term staging for dozens of 45s, tell the yard in advance.

Transload math

The 53ft domestic trailer holds ~3,900 cu ft — about 1.6× a standard 40. Light freight in 45s transloads efficiently into trailers; dense freight in 20s often ships out heavier per trailer than it arrived. A container freight station crew can advise whether consolidation pays for your commodity.

Out-of-gauge and special cases

Cargo that won’t fit any standard box — machinery, project cargo, oversized crates — moves on flat racks or open tops and needs specialized securement and permits. That’s heavy-hauling territory; plan it weeks ahead, not days.

Choosing the right box for your lane

1. Weigh your cargo honestly. Dense freight often ships cheaper in two legal 20s than one overweight 40.
2. Cube it out. Light, bulky freight wants the biggest legal cube — 40HC or 45.
3. Check your dock. Some receiving docks and yards can’t take 45s.
4. Price the whole move, not just ocean freight — dray, chassis, storage, and transload shift with size. Our drayage quote calculator prices any of the three in seconds.

Frequently asked questions

How much weight can I legally put in a 40ft container for Florida roads?
On a standard chassis combination, roughly 43,000–44,000 lb of cargo keeps the gross vehicle weight within the usual 80,000 lb limit. More than that requires a tri-axle chassis and possibly permits.

Is a 45ft container harder to dray than a 40ft?
Slightly — 45ft chassis are less common, and some docks and yards aren’t configured for the extra length. Confirm equipment availability with your carrier before booking.

Should dense cargo ship in a 20ft or 40ft container?
Often two 20s beat one 40: each stays under road weight limits, avoiding overweight permits and tri-axle surcharges. Run both configurations before you book the ocean leg.