Welcome back, backpacks. The newest bag making waves in the fashion world is the original geek-turned-sleek backpack. Deemed the new “It” bag, it boasts a secret weapon, one that many bags ignore: comfort. “After a decade wearing a punishing combination of high heels and heavy bags, fashionable women have apparently had enough,” reads The Times of London. Fashion experts say they’ve spotted them on trendsetters from across the globe—most recently Rihanna, Kristen Stewart, and Kate Bosworth. In the UK, “rucksack” (as they call them) sales are up 30 percent at three major department stores. So zip up that pack fashionistas, nerdy is the new black.