I've been carrying a 35cm Black Togo Birkin, in rotation with other bags, for the past couple of years and am thinking of replacing it with a Box Birkin. I've got a couple of other Togo Birkins -- 30cm Black and 35cm Gold -- that I can reach for in inclement weather. Why would I replace the 35cm Togo Birkin? Because Box is a more elegant, classic and dressy look, and the black is a darker black than the Togo Black. I'd like to hear the pros and cons of Togo and Box Birkins. I'm wondering how the edges and corners of a Box Birkin would fare with use as a work bag, and whether annual spa treatments would be enough to keep it in good shape. Should I just hang onto my 35cm Togo or make the leap into a dressier Birkin? If anyone is thinking of suggesting that I get the Box Birkin and hang onto the Togo Birkin, too, that's not an option. I've already got a big surprise coming next week, and simply cannot add yet another bag to my collection. It would have to be the Box or the Togo Birkin.