So the Maersk E-class capacity of 10k--14k TEU translates to 5k--7k containers of the size you're probably used to seeing.
I did in fact note that:
>> (Note, I'm talking about 40' containers, but the industry talks about 20' so you may find double my numbers on a search.)
There's a specific standard for describing sizes (TEU), and, confusingly, an overwhelmingly prevalent size actually used and which most people will be familiar with of precisely twice that length (40'). The ships you referenced would be carrying 5--10k TEU, not 5--10k 40' containers.
Its' a minor point in the context of the Flexport story, but the inaccuracy seemed worth clarification. That is all.
If you feel like I'm inaccurate after that clarification, then let's continue. I'd hesitate to continue a nomenclature argument online, but since it changes the numbers I've been talking about be a factor of 2, it seems worth resolving.
Explanation appreciated.
A 40' container is either 2 or 2.25 TEU. The .25 is when the container is a bit higher than standard. Though nowadays loads of containers are a bit higher. The extra .25 is ignored in various cases (basically when it doesn't matter).
https://en.wikipedia.org/wiki/Evergreen_A-class_container_sh...
https://en.wikipedia.org/wiki/List_of_largest_container_ship...