Baghunter focused the study on the Chanel Medium Classic Flap Bag, which has been around since 1955. When the bag first hit shelves, it went for just $220, and by 1990, it sold for $1,150. Now, in 2016, it costs a whopping $4,900. Overall, it increased in value by 71.92 percent between 2010 and 2015, which outperforms housing prices and the S&P 500. The researchers found similar, if slightly smaller, price increases for the Chanel Reissue 2.55 in sizes 226 and 227 and the Chanel Boy Bag in small and medium. Most Popular.