I use Aloksaks and like them. I have carried various items in them in a cargo pocket or even the rear pocket of swim trunks. I usually even have a SAK (Vic executive in it) and the Aloksak is usually folded over to reduce the size. I even fold over the closure and have had no problems. After hours in the water, everything inside is bone dry.

Once I took my kids to play in a water park type place and it was in my back packet of my swim trunks. We went down various slides over and over all day. Then we went kayaking in the ocean. End of the day...dry.

Sometimes I worry that the closure doesn't seem too secure, but not a drop of water has gotten in. And I reuse the original one over and over. It hasn't failed me yet. I use a newer one to hold my iPhone for hiking ad camping.