You wear it on the front, see, under your jacket, like you’re a paranoiac kangaroo. It is as oddly shaped as your body is, and it is thin, so you can really only carry some tiny tools, your phone, a wallet, maybe a passport. This is not a bag for much else, so if you have anything more three-dimensional like e.g. earbuds, a sunglasses, camera, etc., you will need to throw all of that in an ancillary pocket or a sling.