Hello, thank you for your suggestion, on the basis of which the supplier contacted us and would like to respond below.
"Hello, we are sorry to hear about your experience with the waterproof case. Before use, you must squeeze all the air out of the sleeve, as shown in the diagram on the back of the product packaging. Please do not hesitate to contact us at
[email protected] if you need to. "
Thank you and have a nice day, Ondřej - Alza expert