I've had my Birkin for about 3 to 4 weeks now and I have only carried for a full day once. I've just started to notice that at the top edge of my bag by the handles it's not straight but kind of wavy. It's a little annoying to me but I was wondering is this normal? Off the subject but the bag weighs a ton and I'm not even carrying anything but my sunglasses, wallet and iphone! However, I can't bring myself to buy a 30 cm Birkin because I love the way a 35 cm looks. Ugh!