“I HAVE ALWAYS FELT super-black, like black as fuck, but I feel extra black as fuck when I wear this bag,” says Raven Baker, age 24, a video producer and social-media editor living in Brooklyn. She’s talking about Telfar’s Shopping Bag, of which she owns four. A simple, boxy carryall with double shoulder straps and top handles, it comes in three sizes, costs between $150 and $257, and has become a symbol of group identity for young, creative New Yorkers, especially queer people and people of color. The bag has been carried by artists like Solange, Selena Gomez, and A$AP Ferg. It appeared at the Met Gala on Moonlight actor Ashton Sanders, who was accompanying Telfar Clemens, the bag’s designer. But the real power comes from its many young fans,…