How much weight can a shipping container floor hold?
A 20ft shipping container can hold about 62,000 pounds of cargo and a 40ft about 58,000 to 59,000 pounds, spread evenly across the floor — that is the maximum gross rating stamped on the door minus the box's own weight. The floor's real limit is concentrated weight, not the total: it is plywood over steel cross-members, so a heavy machine on small feet or wheels needs a plank or a sheet of plywood under it to spread the load.
How much weight can a container hold: the numbers on the door
How much weight can a container hold? Every shipping container for sale carries a CSC plate on the right-hand door with two numbers: the maximum gross weight, which is 67,200 pounds on the standard 20ft and 40ft boxes we sell, and the tare, which is the empty box. The difference is what it is rated to carry. A 20ft standard weighs about 4,850 pounds empty, so it is rated for roughly 62,000 pounds of cargo; a 40ft high cube weighs about 8,600, so a little under 59,000.
That rating was set for a box riding on a ship and a chassis, loaded at a port with a forklift. A used shipping container sitting on a farm outside Laurel or behind a shop in Hattiesburg will never get near it. A 20ft packed wall to wall with household goods is usually a couple of tons; feed, tools and shelving are similar. Total weight is almost never the question. Where the weight sits is.
The empty weights, door sizes and what the rating means for the truck are in how much a shipping container weighs.
What the floor is, and what breaks it
A container floor — the same in a conex box from any line — is thick marine-grade plywood or hardwood bolted to steel cross-members about a foot apart, built to the shipping standard that has a loaded forklift drive in and out. Spread across those cross-members, it carries more than anything a homeowner, farm or contractor will store.
Point loads are what mark it. A welder on four small casters, a compressor, an engine on a stand, a gun safe or a pallet of shingles puts tons on a few square inches, and on a used box the plywood may already be soft in spots from years of cargo. Put a sheet of plywood or a couple of 2x10s under anything heavy on small feet, set heavy things against the side walls rather than mid-floor, and run casters and pallet jacks along the cross-members, not across a soft patch.
If you are buying for genuinely heavy use — a shop full of iron, pallets moved by a tractor's forks, a skid steer parked inside — look at a cargo-worthy or one-trip box with a sound, near-new floor instead of the cheapest used one. The 20ft one-trip and the 40ft high cube one-trip arrive with that floor; one-trip vs used explains what each grade promises. A forklift ramp gets wheels over the door sill without beating it up.
In south Mississippi the ground gives out first
A loaded container rests on its four corner castings, so all of that weight lands on four spots the size of your hand. On Pine Belt clay after a wet week, or sandy fill near the Coast, those corners will sink unevenly long before the floor is in any danger — and a box that settles out of level is a box whose doors stop latching. Set the corners on concrete blocks, treated 6x6s or a gravel pad before you load it; putting a container on grass and will a container damage my driveway cover the options.
Level it empty, the first week, before anything heavy goes in. A 6-ton leveling bottle jack under a corner casting does it in an afternoon; it ships separately and you do the jacking — nothing on the accessories page arrives installed. If the box is becoming a shop, the Workshop Box puts the container and its kit at one delivered price, with the kit as bolt-on, no-drill parts you install yourself.
The truck sets the box empty, so the weight question starts the day it lands on your pad. Delivered prices for every size and grade, by ZIP, are on the containers page. See containers for sale — delivered price by ZIP
Buying a container?
Longleaf sells used and one-trip 20ft and 40ft shipping containers, delivered by tilt-bed across the Pine Belt. Enter your ZIP for the delivered price — it comes straight from the supplier feed and already includes the haul. Locks, vents, shelving and lights are on the accessories page. We sell; we do not rent.
- 20ft Standard Cargo Worthy (used) — from $2,885 delivered
- 20ft Standard One Trip (new) — from $3,635 delivered
- 20ft Standard Wind & Watertight (used) — from $2,470 delivered
- 40ft High Cube Cargo Worthy (used) — from $3,525 delivered
- 40ft High Cube One Trip (new) — from $4,925 delivered
- 40ft High Cube Wind & Watertight (used) — from $3,210 delivered
- 40ft Standard Cargo Worthy (used) — from $3,525 delivered
- 40ft Standard One Trip (new) — from $6,355 delivered
- 40ft Standard Wind & Watertight (used) — from $3,160 delivered
Keep reading
- Where can I buy a 40ft high cube container in the Pine Belt? — 40ft high cube container for sale in the Pine Belt: used or one-trip, delivered by tilt-bed to your lot, and the 130 feet of run and headroom a 40HC needs.
- What does a 20ft shipping container cost delivered in Laurel, MS? — 20ft shipping container for sale in Laurel, MS: how grade, height and the haul up from Mobile set the delivered price, and what to check on a Jones County lot.
- How many cubic feet are in a 20ft shipping container? — 20ft shipping container cubic feet: about 1,170 inside a standard box and 1,320 in a high cube, what that space really holds, and sizing one in the Pine Belt.
- How much does a shipping container weigh? — Shipping container weight: empty tare for a 20ft and 40ft, the maximum gross rating, why a loaded box never nears it, and what the weight means for your pad.
- Where can I buy a shipping container in Lucedale, MS? — Shipping containers for sale in Lucedale, MS: used and one-trip 20ft and 40ft boxes delivered across George County, priced by ZIP, and what to check first.
Across the Pine Belt
Hattiesburg · Petal · Laurel · Ellisville · Purvis · Sumrall · Columbia · Collins · Seminary · Wiggins