I had to buy some recently and I learned that there's air pots and air pots, the 1st ones I bought had smaller holes at the top and got bigger lower down, the ones I bought recently have holes all the same size top to bottom and 1" taller (annoying AF, the 1ltr ones are lighter guage and a bit flimsy compared to the old original ones.
They'll work just the same but they aren't as user friendly for keeping coco in the pot.
There amazing pieces of kit, I see them as an investment/upgrade rather than just a pot.