Whether it was the adjacency to newlywed Lauren Sánchez Bezos or the $10.1 million price tag, with fees—or even the enduring legend of the namesake, herself—the recent sale of Jane Birkin’s original Birkin bag at Sotheby’s Paris to the Japanese luxury resale conglomerate Valuance ushered in its own pop culture news cycle. And while the sale set a record for a handbag at auction, the secondary luxury handbag market has been experiencing exponential growth over the past 15 years—particularly in Hermès Birkins and Kellys, both known as quota bags because clients are limited in the number they’re permitted to purchase each year (assuming, of course, they qualify to buy one in the first place).