The difference between a Hermès Birkin and a Hermès Kelly becomes quite apparent when considering how each feels as compared to how they look. A Birkin is a bit more casual because it has two handles, it is more open, and you can simply leave it open since there is no necessity to keep it closed, which means you do not have to think about carrying it. A Kelly appears to be a little more formal due to its structured form, one handle, and flap, which is supposed to be closed all the time. The thing is that a Kelly also has a shoulder strap, yet this feature does not change anything because of its formal image. Thus, to say it briefly, a Birkin looks and feels more informal, whereas a Kelly is a more formal choice.