How the shipping container changed everything

A pair of trainers made in Vietnam arrives in a shop in Manchester having crossed most of a planet, and the sea leg of that journey costs less than the bus fare from the shop to your house.

That isn't clever logistics software or cheap fuel. It's a steel box with reinforced corners, and the reason it works has less to do with the box than with the fact that everyone agreed on the same one.

What a dock used to be

Before the container, loading a ship was a craft. Cargo turned up at the quay as barrels, crates, bales, sacks, drums, bundles of timber and loose machinery, all different shapes, and gangs of dockers moved it aboard piece by piece with slings, hooks and a lot of shouting. Stowing it was genuinely skilled work, and it wasn't optional — get the weight distribution wrong and the ship handles badly or rolls over. A general cargo ship might be alongside for a week, sometimes two, while several hundred men fitted a jigsaw into its holds.

The economics of that were miserable and everybody knew it. A ship that's tied up earns nothing, and merchant vessels of the era spent something close to half their working lives in port. Handling costs could swallow a quarter of the value of what was being shipped, occasionally more. For anything cheap and bulky, long-distance trade didn't really make sense.

Then there was the theft. Docks were famous for it. Cases of whisky, cartons of cigarettes and small electrical goods leaked steadily out of every port in the world, so reliably that insurers priced it in and shippers wrote it off. If a crate could be opened, it would be.

The obvious fix — put everything in identical big boxes — wasn't a new thought. Railways had been shifting containerised freight in various forms since the nineteenth century, and several shipping lines had tried versions of it. Nobody had made it stick, because a box that only fits your ship and your crane isn't a system. It's just a heavier crate.

The trucking man who got tired of queueing

Malcolm McLean was not a shipping man. He was born in North Carolina in 1913, started with one second-hand lorry during the Depression, and built McLean Trucking into one of the largest haulage firms in the United States. The story he told for decades was of sitting on a quay in New Jersey in 1937, waiting hours for his load to be unpacked from his trailer and manhandled aboard a ship, and wondering why the whole trailer couldn't just be lifted on.

Whether the moment happened quite that neatly doesn't much matter. The point is that he came at the problem as a road haulier, so he wasn't thinking about ships at all. He was thinking about the join between one mode of transport and the next, and that's exactly where the cost was hiding.

By the mid-1950s he'd worked out that the American regulators wouldn't let one company own both a trucking firm and a shipping line, so he sold the trucking business and bought a struggling coastal operator, Pan-Atlantic Steamship, which he'd later rename Sea-Land. Then he converted a war-surplus tanker.

On 26 April 1956 the Ideal X left Port Newark, New Jersey, for Houston with 58 containers strapped to a reinforced deck above her tanks. Lorries met the ship at the other end and drove the boxes away. It wasn't elegant, and the ship was still carrying oil underneath, but nothing had to be unpacked at either end.

The numbers that ended the argument

The comparison usually quoted, and the one that did the persuading, is the loading cost per ton. Moving loose cargo aboard a general ship by hand ran to something like 5.83 dollars a ton in the mid-1950s. Loading the Ideal X worked out at roughly 16 cents.

That's not an improvement. That's a different category of activity.

Time collapsed alongside cost. A gang of men filling a hold might manage a few tons an hour each; a purpose-built gantry crane lifts a loaded container in a couple of minutes, and a modern terminal runs several cranes on one ship at once, so a vessel carrying the equivalent of thousands of lorry-loads can be turned around in a day. The first crane designed specifically for the job, a Paceco Portainer, went up at Alameda in California in 1959, and every container crane you'll see today is recognisably its descendant.

The pilferage went too, almost overnight. A sealed box that nobody opens between the factory and the warehouse gives a thief nothing to work with, and marine insurance rates on containerised cargo fell accordingly. Nobody planned that as a benefit. It came free with the sealing.

The box is nothing without the agreement

Here's the part that gets skipped, and it's the part that actually mattered.

McLean's early boxes were 35 feet long, because that was the maximum trailer length allowed on the roads he cared about. Matson, running to Hawaii, used 24-footers, because their cargo was dense pineapple and sugar and a longer box would exceed crane limits. European operators and the railways had their own preferences. Every one of those choices was locally sensible and collectively useless. A Sea-Land box couldn't be lifted by a Matson crane, and a container that can only be handled at one port isn't much of a container.

The unpicking of that took most of the 1960s and was done through standards committees, which is the least cinematic possible venue for a revolution. The International Organization for Standardization settled on a family of lengths — 10, 20, 30 and 40 feet — with a common width of 8 feet and a common height of 8 feet 6 inches. More important than the dimensions were the corner castings: eight steel fittings, one at each corner, with slotted holes in a precisely specified position.

Those castings are the actual invention. They let a crane grab any box in the world with the same spreader, let a twistlock secure one box to the one underneath with a quarter turn, and let containers be stacked into a self-supporting block rather than lashed as a pile. McLean's company held patent rights on its fitting design and released them royalty-free so the standard could be built around them. Had he charged for it, the standard would have gone elsewhere or nowhere, and the whole thing might have stalled for a decade.

Once the sizes were fixed, the unit of world trade became the TEU — the twenty-foot equivalent unit. A 40-foot box counts as two, which is why capacity figures always look slightly odd.

The war that paid for the Pacific

Containers spread across the Atlantic in 1966, when Sea-Land's Fairland sailed to Rotterdam and the Dutch, unencumbered by a dock workforce with a century of habits, took to it faster than the British did.

The bigger push came from Vietnam. The US military supply operation there was chaotic, with matériel piling up in ports faster than anyone could sort it, and from 1967 Sea-Land won contracts to run containerised supply into Cam Ranh Bay. It worked, spectacularly, and it gave the boxes an institutional endorsement that no commercial customer could have provided.

It also handed McLean a problem he turned into the trans-Pacific trade. Ships arrived in Vietnam full and left empty, and an empty ship is a loss. So on the return leg they called at Japan and picked up cargo. Japanese manufacturers got cheap, reliable, sealed freight into the American market at precisely the moment they had things Americans wanted to buy. The route that would dominate world trade for the next half-century opened as a way of avoiding empty sailings.

Ports stopped being where cities are

A break-bulk port wants to be central, because cargo is handled in small units and needs warehouses, carters and merchants close by. That's why the great docks were in the middle of great cities — the Pool of London, the Manhattan and Brooklyn waterfronts, the finger piers of every port town.

A container port wants the opposite. It needs deep water, a lot of flat land for stacking boxes, and direct road and rail access. Historic city-centre docks didn't have any of that and couldn't get it, so the trade simply left.

New York's cargo crossed the Hudson to Port Elizabeth and Newark in New Jersey, where there was space. London's upstream docks shut through the 1960s and 1970s and the traffic went downriver to Tilbury and, more consequentially, to Felixstowe — a small Suffolk harbour that bet early on containers and became Britain's largest container port. Liverpool declined. Rotterdam grew enormously. The old dock districts became derelict, then decades later became flats and offices with the cranes kept as decoration.

This is the least discussed part of containerisation and probably the most visible. Whole neighbourhoods were built around the work of loading ships, and the work moved twenty miles away to a fenced yard employing a couple of hundred people.

The men who used to do it

Longshore work was hard, dangerous and often casual — men queuing at the gate for a day's hiring, with all the corruption that invites. It was also skilled, well-paid by the standards of manual labour, and the foundation of tight communities with unusually strong unions.

Containers destroyed most of those jobs. Not gradually. The port of New York had tens of thousands of registered longshoremen in the 1950s; within about twenty years the number had fallen by the great majority, and the same pattern repeated in London, Liverpool and Rotterdam.

The unions saw it coming and responded differently in different places. On the US West Coast, the longshoremen's union under Harry Bridges signed the Mechanization and Modernization Agreement in 1960: the employers got a free hand to automate, and in exchange the existing workforce got guaranteed pay levels, generous early retirement and a fund financed out of the savings. It's usually described as one of the better deals a union ever struck in the face of a new technology, and it's still argued about, because what it protected was the men already on the books. It didn't protect the jobs that would have gone to their sons.

New York ran its own guaranteed-income scheme, which ended up paying substantial numbers of men to sit in hiring halls with no work to do. British ports had bitter and prolonged disputes, and the National Dock Labour Scheme wasn't abolished until 1989.

The honest summary is that containerisation made freight almost free and did it by eliminating hundreds of thousands of well-paid jobs, and that the people who lost them were, at best, compensated. Both halves of that are true and the second half tends to get left out.

What almost-free freight actually did

Once moving a ton across an ocean cost very little, the calculation behind where things get made changed completely.

Distance stopped being a serious cost. A factory 10,000 kilometres from its customers is no longer at a meaningful disadvantage against one 500 kilometres away, so production migrated to wherever labour, land, regulation and scale were most favourable — and the resulting flows made East Asian manufacturing possible in the form it took. Shipping a 40-foot container from China to northern Europe costs a few thousand dollars in normal conditions. Divide that across the several thousand items packed inside and the freight cost per item is small change.

It also let a product be made in pieces in several countries. Break-bulk shipping was too slow and too unpredictable for components to cross oceans mid-assembly. Containers run to a timetable, and that's what turned a supply chain into something you could actually schedule. Just-in-time manufacturing, with parts arriving days before they're needed rather than sitting in a warehouse for months, depends entirely on freight being both cheap and reliable.

Ships grew to match. The Ideal X carried 58 boxes. By 2006 the Emma Maersk was carrying somewhere around 15,000 TEU, and the largest ships now handle over 24,000. Ports have had to keep dredging, and the Panama Canal built an entirely new set of larger locks, opened in 2016, because the ships had outgrown the old ones.

What the box still can't fix

Trade is lopsided, and boxes don't flow evenly. Far more loaded containers head from Asia to Europe and North America than come back, so a large share of container movements — roughly a fifth of the total, by common estimates — consists of shipping empty steel boxes back to where they're needed. Whole businesses exist purely to reposition empties.

Some go over the side. The industry's own figures put losses at sea at somewhere around a thousand containers a year on average across the whole world fleet, spiking badly in bad years with heavy weather or a stack collapse. Against a couple of hundred million container movements a year that's a tiny rate, and it's still a lot of cargo sitting on the seabed.

And the efficiency is brittle. A system with almost no slack in it fails hard when something jams — a ship wedged across the Suez Canal, a port closure, a shortage of empties in the wrong hemisphere. Freight rates that sat at a couple of thousand dollars a box can multiply several times over in months when capacity tightens. There's nothing about the container that guarantees resilience. It optimises for throughput, and it was designed by people who wanted ships to stop waiting.

McLean himself didn't end up rich from the endgame. He came back into shipping in the 1980s with United States Lines and a fleet of large, fuel-efficient, slow ships built for a world of expensive oil; oil got cheap, the ships were wrong, and the company collapsed in 1986 in what was then one of the biggest bankruptcies in American history. He died in 2001. Container ships around the world are reported to have sounded their horns on the morning of his funeral, which is either sentimental or the correct amount of respect for a man who worked out that the expensive part of shipping was never the sea.