These sounded perfect for our beach holiday. It’s cool they come in twos because that’s how many we need. They fit my LG V30 and my wife’s iPhone 7s plus perfectly. They are slightly fiddly to open and get the device in the pouch, but nothing difficult and the seal seams to works great and locks securely. That they have a carry strap you can attach (if desired) which is great and makes them easier to carry (the pouch might be a bit big for a pocket).
You can use the phone through the plastic covering (front side only) and that works just fine - I imagined it would work hesitantly, but it doesn’t - it works great.
At £5 each for something this practical and effective ( and even good looking) is really good value. We are both very pleased with them and looking forwards to our holidays with a phone secure from water and sand etc.