I had a look and noticed BulkPowders do empty tubs in 3 sizes. I was hoping Lakeland would have some but my mother (a Lakeland cult member) said they didn't do anything suitable.
are these sizes correct? an extra 5 litre really doubles the amount of powder the 2.5kg tub can hold?3.5 Litre empty tub holds approximately 1kg of powder
11 Litre empty tub holds approximately 2.5kg of powder
16 Litre empty tub holds approximately 5kg of powder