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
- Weigh your cargo honestly. Dense freight often ships cheaper in two legal 20s than one overweight 40.
- Cube it out. Light, bulky freight wants the biggest legal cube — 40HC or 45.
- Check your dock. Some receiving docks and yards can’t take 45s.
- 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.