When you hit 30, despite all the moaning and groaning, you suddenly seem to know yourself better than ever. What you need, what you want: it’s all within your reach. Bags included! Your 20s are for experimenting; by the time you’re into the next decade, a few investment-level pieces are key. Your essentials should be well-made and timeless enough to last the long haul, but they shouldn’t be so stodgy and mature they make you look like you’re in a rush to get older. Here, the five essentials for the girl who does it all, and does it at the right pace: