Bra cups are relative to band size. For reference, a 36C is roughly the same volume as a 32E. These are call sister sizes.

I’m tired of guys saying ‘uwu G-cups’ without any context. A 30G is the same as a 42B. Start asking what their band size is ffs. It’s like saying 'she weighs 120’. 120 what? Bags of flour?

Yes, bags of flour. That’s a measurement I can get behind.
Well over here a bag of flour is exactly 1kg so I can live with that
here i have seen 1kg, 2kg and 25 kg bags