I use this belt for running, but also around the house to hold my phone when I don't have any pockets. I have also used it when going out, without a handbag. It's very small (just right for a phone and one key), which is exactly what I wanted.
light, comfortable it is a snug fit for a J3 but more than adequate for £7
It a small bag/belt to carry your phone and a key or two. The bag feels a little flimsy but seems strong enough in action. It just fits a Samsung S6/S7 but definitely nothing bigger. Buy a bright colour if you're a bit on the larger size like me. When the grey one I got peeks below your t-shirt when running it looks like your belly. Not a good look! I will buy again but in a different colour.