It all depends on the amount people are in the household or how much washing you do
For those on their own or a small household, you may get away with just a 6kg, households with more people will likely need a 7-9kg. But if you wash your own bedsheets/bedding, then you’re going to need a bigger size – more around 8 or 9 kg. While bed sheets may be light in weight, they can be bulky and might overload a small machine.