Key rings no longer serve a strictly utilitarian purpose. Today's models explore new uses, and are happily used as a charm or even jewel on a bag. Longchamp updates them eachseason with a wide range of choices, always paying the same attention to detail. Key rings no longer serve a strictly utilitarian purpose. Today's models explore new uses, and are happily used as a charm or even jewel on a bag. Longchamp updates them each season with a wide range of choices, always paying the same attention to detail.