The Hermes Kelly bag is a coveted bag. Like its muse, Grace Kelly, this bag is the definition of timeless elegance.Kelly handbags come in two styles – Retourne and Sellier. The Retourne, also called relaxed or souple, has the side seams stitched on the inside of the bag, creating a more relaxed handbag. The Sellier, also called rigide, has the side seams stitched on the exterior giving the bag a stiffer and more triangular form. Kelly bags come in 19cm, 25cm, 28cm, 35cm and 40cm sizes.Hermes introduced a revamped miniature version of one of its most celebrated and highly coveted bags.