A practical collapsible container still has not been made. If you could stack 3 collapsed containers in one slot, that could be a game changer for repositioning.
> A practical collapsible container still has not been made.
That's yet another idea that people often think of when people wonder about improvements for container shipping. The container shipping company I worked for studied it every few years. There's various reason why it hasn't been done. It's not just the container or the container vessel. It would be good to reach out to the right people and see what the problems were that prevented this from being used. It wasn't about making a container collapsible, it was stuff surrounding that.
There are sometimes some really nice cost saving projects that were pretty innovative. Plus maybe also easy if someone thought of it. But often it required a bit more knowledge to think of than "add sails" or "collapsible container".
One fun thing what a few shipping companies many years ago is to take existing vessels and make them bigger. So really cutting various parts of the steel and adding more (e.g. height). An random Google example (use retrofit as search term): https://gcaptain.com/upgrades-to-famous-maersk-e-class-to-bo...
