I don't know if anyone saw my vlog about man bags (bit of a plug there, soz!), but if you did, you'd realise I'm a bit obsessed. Since recording that video I've added another three to my collection. And ooops, it might be a fourth quite soon, what with Mulberry's brand new Single briefcase.Now, I've never been one for a briefcase, I think it's because I've never worked somewhere that's very formal, but I've come to realise that it's how you wear something, not the situation you wear it in. A briefcase (or even one of those amazingly old-fashioned doctors bag) with a pair of jeans and a tee makes an amazing outfit if you ask me!For autumn/winter, Mulberry's Single Briefcase (because it's not married - a little joke there) is all about heritage detailing and elegant functionality, which to me really means being able to fit in my Jackie Collins book, Anna Wintour size sunnies and lunch - a family size bag of Haribo. This briefcase has enough room for it all.And what's more, you can colour code your bag to your wardrobe, thanks to the different colour leathers. My favourite is the grey.