The Hermès Birkin prototype, originally made for Jane Birkin, sold at a Sotheby's auction in Paris for $10.1 million. What to know about the unique and coveted purse.

Sketched out on an air sickness bag, it became fashion’s must-have accessory.The original Birkin bag, named after the actor, singer and fashion icon that Hermès created it for — the late Jane Birkin — is up for auction in Paris on Thursday.