Purchased to put gray card, driving license, keys and smart phone safe from sand and water for the holidays .... this "pocket" can hold all this remains discreet and above is perfectly sealed. I bathed with to prevent a family member stays on the beach to watch the affairs .... And everything is no problem stays dry. As against the double zip system is very effective but did not open the bag fast enough to take a call. It was not the purpose of my purchase so I'm very satisfied and I recommend. Thank you as usual at Amazon for the speed of delivery.