I was using a 'waterproof' pouch bag to store my keys and documents while swimming. Well, it was waterproof until because of wear (after a few uses) I've got a small punctation in the edge, and everything was wet inside.

I don't want to damage my car keys, and my scuba diving friends have recommended me the scuba diving egg like this: enter image description here to be full water proof in the shallow waters.

The problem: how to use it while swimming? When I'm swimming with a swimming bag, it's not an issue, but then I don't need anything else to store my keys. But swimming shorter distance near to shore, I don't need a swimming bag, and this egg looks as an interesting alternative. But I have no idea how can I mount it so it doesn't be awkward while doing swimming strokes (a wrist would be quite a terrible choice, obviously).

  • Seems way too big to stuff in your swimsuit, as you say you don't want it on your wrist. Attach to a simple lightweight webbing belt around your waist?
    – Jon Custer
    Commented Oct 7, 2021 at 21:02
  • @JonCuster nice idea Commented Oct 7, 2021 at 21:12
  • If they have one with a belt loop to hold it firmly (say on your back) that would be best. That loop of string looks like it might bounce around which might be irritating.
    – Jon Custer
    Commented Oct 7, 2021 at 21:24

1 Answer 1


The egg in your image seems to be 11.5 x 6 cm according to a google search. That should be small enough to not be a huge problem.

My suggestion would be to go with one of the following:

  • Attach it to your bathing trunks - especially if you have surf shorts or some similar variant they often have a pocket with a little loop to attach keys or similar. Alternatively attach it to the strap used for tying up the shorts in the front.
  • Wear it as a necklace around your neck. Note that due to buoyancy the egg will likely switch to your back and be dragged behind you while swimming - however, drag should be small enough to not be a huge issue, and it's a lot better than having it attached to your arms/legs which move through the water a lot more than your torso/neck does.

I have done both with similarly small keep-my-stuff-dry products, and it worked well enough.

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