Not sure if this is the place to ask this.

Any idea where I could find waterproof transparent case/bag to store my key + access card + phone (if can) which I could safely keep in my beach pant's pocket during swimming session.

I'm always wary about leaving my access card on the bench while swimming, though it was concealed with a towel, but a quick 1/2 second swoop, it would be gone and I'd be still underwater.

Any suggestions?

PS: Aside from that, if I could bring the phone in, maybe I could try the swimming tracking app. Wonder if it works.