The glass bag inverts the key purpose of purses, that they hold, and hide, the messy but necessary items of life—tampons and used tissues and crumpled receipts. Instead the Coperni serves as an elaborate frame for its contents. The Kar-Jenners are masters at integrated product placement, and the Coperni glass bag is a perfect accessory for their cause. “It’s a great way to advertise something you want people to see,” fashion historian Kimberly Chrisman-Campbell tells me. She also sees it as a gambit, in the age of Instagram, when virality is prized above all else. “It’s becoming ever more important to have something eye-catching, whether it’s a naked dress or a naked purse, to ensure that photos get shared.”