I use a 6 at bucket like one below. I think it's good for around 3000 grams but you may be able to stretch it to 4000 if you don't expect a lot if rising.
Here’s a pic of 2400 g dough in flight. Would easily work with 4 kg.
Image
Plenty of room for stretching, folding. Only downside is tub is light enough to come up and off counter on initial folds. On the other hand it’s light and easy to store up high and out of the way. From Amazon or ???
I use a 6 at bucket like one below. I think it's good for around 3000 grams but you may be able to stretch it to 4000 if you don't expect a lot if rising.
https://shop.kingarthurflour.com/items/extra-large-dough-rising-bucket
Here’s a pic of 2400 g dough in flight. Would easily work with 4 kg.
Image
Plenty of room for stretching, folding. Only downside is tub is light enough to come up and off counter on initial folds. On the other hand it’s light and easy to store up high and out of the way. From Amazon or ???
Phil