Review on Speed Hound Marathon Swim Buoy: Ultimate Open Water Swimming Buoy 🏊 and Flotation Device with Dry Bag - Ideal for Triathletes, Swimmers, and Snorkelers! by Cory Jacobson

I love the float but actually bought it to take on a cruise to keep some valuables dry. When I went to try it yesterday I couldn't find where the dry part was. The instructions say throw things in, fold several times, fasten. I thought it was some kind of zipper - how else is everything supposed to stay dry? - Oh no. My cell phone was soaked, as were credit cards and cash. Can someone tell me how to use this? Am I doing something wrong?