Oh, it wasn't the sagging I was thinking about. I would love if my bag looked anything like that, but I think that's the large one. I mean the small wrinkles you see in the leather when the leather dry up, perhaps that's what you meant too? I haven't used mine yet but I think I'm gonna treat it before usage.
Oh yeah I have those small wrinkles too...the Bick 4 helped somewhat. I massaged in the Bick 4 a few times - massage, buff, rest, and repeat. It looks less wrinkly but not perfect. Perhaps Blackrock/Obenauf treatment would be better? If I ever get the products and do that treatment, I'll post my results!