Well, I don’t know that there is a secret... about 70% of the ones that were in the bag when I first saw it were flat. Because they were flat, the “belly” of the birkin had no support and therefor sank and got slouchy. My SA simply replaces the pillows so the bag was sufficiently supported and magically it straightened up quite a lot in a few days time. I actually store my bags at home with triangle shapes pillows and I find that this works miracles on keeping bag shape!Stunning bag!!!!! I'm new in the world of Hermes (after spending many many years with Chanel--which I still love) and I had no idea that you could straighten out slouch on a Birkin by using the air pillows--is there a secret to how to use them to get them to work? Anyway, congratulations again--the bag is gorgeous-- wear it in the best of health!