An insider tells TheGloss that Hermes has a big weapon in its fall arsenal – a new handbag they believe will rival the Birkin. The bag, which doesn’t even have a name yet, is all black – not just the exterior, but the interior and fixtures (snaps, handle, etc) are black as well.

If you have more info on this new mystery bag and whether Lady Gaga has plans to scrawl all over it in Japanese, please email us at tips at thegloss dot com.

In the meantime, though, we’ll be amusing ourselves with possible ideas for the name of the bag. I vote for “The Gainsbourg” – who better to name the bag after than the daughter of the woman who inspired The Birkin?

Update (7/2/10): A source tells us the bag will be called “So Black.”