Don’t call it a comeback. Fanny packs have shifted from bulges around tourists’ midsections in the ’80s to high-fashion utilitarian accessories seen on runways a few years ago. The latest “belt bags” are smaller, made of softer leathers and exotic materials like snakeskin, and rendered by designers such as Rachel Zoe, DKNY, and the L.A.-based Hipsters for Sisters. Because you know you’ll need both thumbs for that smart phone.