On a recent unintentional swim, I learned about the importance of having a good way to store car keys, wallet...etc. in a dry place. I spent about 10 minutes in the water after a wakeboard wake washed me out of my canoe. I feared the worst for my car keys. They are the electronic push-button kind. And the car is a push-button start. I wasn't sure how I would even start the car if that key got wet. I opened the pack and, to my surprise, all the contents were still bone dry. This waist pack is super easy to use, and it works great. It comes in 2 and 4 liters. I have the 2-liter pack and find it adequate for phone, wallet, keys matches and a few napkins...etc.
https://www.over-board.com/pro-light-waterproof-waist-pack-3-litres.html
https://www.over-board.com/pro-light-waterproof-waist-pack-3-litres.html