What bra size is bigger 30A or 30AA?

In the context of bra sizing, a 30A is larger than a 30AA. The number in a bra size (e.g., 30) refers to the band size, which is the measurement around the ribcage just below the bust. The letter (e.g., A or AA) indicates the cup size, with A being larger than AA. So, a 30A would have a slightly larger cup size compared to a 30AA.