After being splashed across the pages of Us Weekly and People on celebs galore, the Balenciaga Arena “City” bag (also referred to as the motorcycle bag) is still hot and going strong. The Madonna of handbags gets reinvented with new colors, patterns, or fabrics each season, keeping it a trendy must-have for young fashionistas. And new these days is the Arena Giant Pompon, a larger tote with some of the same design elements as its best-selling predecessor. The roomier hobo, more grown-up than its kid sister, is the perfect daytime carryall. Pick it up for $1695 at Barneys New York (Copley Place, 100 Huntington Avenue, Boston, 617.385.3300).