This is the Bb size (according to the website it’s 10.6 inches in width which is about 27cm). My birkin bag is 30 so the size difference in terms of the width doesn’t sound like much but my Capucines feels MUCH smaller than my birkin 30 and I actually really like it because of this. I feel like they are totally different bags for different purposes and I like using my Capucines as a shoulder bag while a birkin is 100 percent a handheld bag. Even if you get a birkin in 25, I think you’d be happy having both that and a Capucines

. Sorry, I’d post a comparison pic but my birkin is at a spa right now lol