What is common way how to transport personal belongings while swimming?
I am talking about scenario when I need to cross a lake by swimming. I would like to take my stuff (wallet, cell phone, shorts, t-shirt) with me in some waterproof sack or something like that. What is the correct/recommended gear for this job?
If I try to search for "swimming bag" or similar, I find only results related to fancy bags for carrying stuff to/from swimming training.
To clarify my question. I know there are waterproof bags on the market. My question is more about what is the best gear (or class of gear) according to experience of somebody who actually try that.