I have a bit of a thing for foldable shoes, because they're so useful on a night out. When you wear killers heels and dance all night long like I do, the walk home (or even just to the taxi rank) can be a killer, no matter how many pairs of gel foot cushions you've squeezed into your Gina's. So I like to carry a pair of flats in my handbag for the walk home. That's where fold up or roll-up shoes come in handy. They take up less space, leaving room for more lipgloss. Sue London's flats with their own storage bag are pricey at $120, but trust me, you don't want to try rolling up your regular ballet pumps!