Submerge Waterproof Wallet | Must Zip All The Way UP – Pull Very Tight | Helpful as Small Waterproof Bag for Swimming | Hold Cash, Keys, Cards in This Waterproof Pouch for Swimming | Beach Safe

I used this for surfing during a holiday to Cornwall. I needed somewhere to put my van key and took the added measure of using a small triple lock dry bag to put the key in and then put it into the Submerge wallet. It was a bit of a squeeze, so would depend on the size of the key obvs, but it worked a treat. With the zipper pulled up tight it appeared no water got into the Submerge wallet and definitely no water entered the dry bag.

There’s not much out there that can do the job of looking after a car key that isn’t waterproof to allow you to enter the sea whilst leaving the rest of your stuff stashed in the car/van, so I rate this product and am happy to recommend it.