When I went to Taiwan I found an interesting product.
It is made by paper that TYVEK. Good points are 100% water proof, 100% tear proof. It is interesting due to it looks normal paper.
These products designed by 2 designers in Taiwan.
Their brand name is “GreenWood Lab”
And they have a website, you will see their works there.
I’ve been using a passport case. I don’t have to care about water, sweat. So it is convenient to mobile.