Alexa's Carven round bag, see below to purchase (color not available online)
Laura Carmichael from Downton Abbey proved she's way more fashionable than her TV counterpart by showing up at London Fashion Week with a Carven round bag.
I just purchased this one by Kelsi Dagger that I saw on whowhatwear.com. I love the classic color and simple style of the bag. It has a timeless feel, despite the unusual shape. Hopefully it'll be something that will wear well and I'll be able to bring out again in several years when it comes back into style!
I also like this Topshop studded one, which is more trend, less classic.
There are also some great vintage ones of course, so check out these great ones before they're snapped up by someone else (possibly me).
Like this one