Question about Brabantia Storage box square 1.6L

Unfortunately, I don't know how the previous commentators came to the conclusion that 1kg would fit? I relied on their statement and had to realise that it doesn't work. A Google search for "flour density" returns 0.57 g/ml as the first hit, i.e. 1kg corresponds to approx. 1.75L - which confirms my experimental experience...

Sure, even more

Yeah, sure.