Sure, it's not the most timeless buy, and you may be unsure of how to wear it at first, but there's a good reason the fashion crowd are big into this bag. Find the right one and this add-on has the power to make your outfit infinitely cooler, not to mention your life easier: Imagine rushing for the bus when you're on Insta Stories drinking a skinny flat white and waving at someone at the same time—only possible with a belt bag. Wear it on the waist, across the body, or on one shoulder, or keep things simple and loop it into your favourite pair of jeans instead of your regular belt. Cost per wear, people—cost per wear.