Please forgive the naive questions - I'm new to b-bags. I went in wanting a First and walked out with a Twiggy. I love the Twiggy but I'm still obsessing over the shape of the First. My problem is that I thought the First might be a tad small. But I'm not sure if I thought the First was too small because I looked at the Twiggy at the same time ... and the two bags are so different size wise. Help!!!