It is pretty hard to transplant form one bucket to another.
The perlite will melt,
the roots will be exposed,
and then they get damaged.
I transfer from cups to buckets,
but I have to destroy the cup in the process.
It helps to hold some shape if the perlite is wet,
but it is still pretty tense.
So with the perlite very wet,
I make a hole in the bucket the shape of the cup.
Then I remove the bottom of the cup and place it in the bucket.
After the cup is in the hole,
use the scissors to cut down the side in three or four places.
And then remove the pieces of the cup
It would be pretty hard to do this with a bucket,
cutting the bottom off and then cutting down the sides.