Can You Actually Keep Your Phone Dry While Swimming? We Tested It

Key Takeaways

• Yes, you can swim with your phone dry, but only with an integrated auto-sealing pocket or an IPX8 pouch. A regular zip pocket will flood within seconds.
• Water pushes into any opening under pressure. At swimming depth (3 to 6 feet), even small zipper gaps let water in.
• A true waterproof pocket uses a magnetic double-lock auto-seal, not a zipper, which is why it holds at depth.
• Modern phones survive brief splashes (most flagships are IP68), but IP68 is rated for fresh water, not pool chlorine or salt, and the rating fades with age.
• In our dunk test, a sealed pocket kept a phone bone-dry through repeated full submersion; a standard mesh-lined swim pocket failed on the first dunk.
• The phone is only half the risk. Your hotel key card, cash, and car fob have no water rating at all.

People ask this before every beach trip or pool day, and the honest answer is yes, with the right gear. A sealed waterproof pocket keeps a phone dry through full submersion. A normal swim trunk pocket does not. Here's what we found when we put both in the water.

The Short Answer, Then the Test

A phone stays dry while swimming only if it sits behind a true waterproof seal rated for submersion. That means an IPX8 auto-sealing pocket or a submersible pouch. A standard pocket, even a zippered one, lets water in once you're under the surface.

We ran a simple test. One pair of waterproof pocket swim shorts with a sealed dry pocket. One ordinary pair with a mesh-lined zip pocket. Same phone model in a sealed sandwich bag for safety, same pool, same depth.

The sealed pocket held through ten full dunks to roughly 5 feet. Bone-dry inside, every time. The zip pocket let water in on the first dunk and stayed wet. That result lines up with how water pressure actually behaves, which we'll break down next.

Why Regular Pockets Flood Underwater

Water doesn't just seep into a pocket. It gets pushed in by pressure. Every foot you descend adds roughly 0.43 psi of pressure, so at 6 feet your pocket is under noticeably more force than at the surface.

A zipper is a row of interlocking teeth with thousands of tiny gaps. Those gaps are fine against rain. Under submersion pressure, they act like an open door. The water finds every seam.

An auto-sealing pocket works differently. It's a magnetic double-lock dry bag built into the pocket: two magnetic strips snap together and pull the opening into one continuous airtight seal. No teeth, no seam for water to exploit. That's the same magnetic auto-seal technology used on the dry bags, shrunk down to pocket size.

What the IPX8 Rating Actually Promises

IPX8 is the part of the IP Code (international standard IEC 60529) that covers continuous submersion beyond 1 meter. It's the rating that matters for swimming, because swimming is sustained submersion, not a quick splash.

Dry Pocket's pockets carry an IPX8 airtight seal tested to 100 feet deep. That's the difference between "keeps the rain off" and "I can dive to the bottom of the deep end and my phone is fine."

One caveat worth saying plainly: your phone's own IP68 rating is not a swimming pass. Manufacturers like Apple note that water resistance is not permanent and can diminish over time, and the rating is tested in still fresh water, not chlorinated or salt water. Don't trust the phone alone.

What We'd Actually Trust in the Water

After the test, here's the practical ranking for keeping a phone dry while you swim.

Best: an integrated auto-sealing pocket. It's attached to your shorts, so there's nothing to hold or drop. You swim normally and forget it's there. This is the setup we'd pick for a pool day or ocean swim.

Good backup: a submersible pouch on a lanyard. Works, but it dangles, fogs up, and makes the touchscreen clumsy. Fine for occasional use.

Not worth it: a zip "water-resistant" pocket. It buys you a rain-and-splash buffer and nothing more. Don't swim with anything you can't replace in one.

The same logic covers the stuff people forget. Your key fob, hotel card, and folded cash have zero water rating. A sealed pocket protects all of it in one place. If you kayak or paddleboard too, the pocket matters as much as the bag you bring, since the pocket is what you reach for constantly.

The Mistake Most People Make

They confuse water-resistant with waterproof and learn the difference the expensive way. A pocket labeled "water-resistant" is built for weather, not for swimming. We dug into that exact gap in our breakdown of IPX8 versus water-resistant shorts, and it's the single most common reason phones die at the pool.

The other mistake is trusting a phone case rated IP68 to handle a full swim. It might. It might also be three years old with a worn gasket. When the replacement cost is $1,000, "might" isn't good enough.

If you want a phone-dry swim with zero babysitting, a sealed pocket is the move. Browse the waterproof pocket swimwear collection to see the auto-sealing styles we put through the test, and pick the inseam and look you'd actually wear.

Frequently Asked Questions

Q: Can I really go underwater with my phone in a waterproof pocket?
A: Yes, if the pocket is rated IPX8 for continuous submersion. A true auto-sealing pocket uses a magnetic double-lock that pulls the opening into an airtight seal, so water pressure can't force its way in. A zippered or "water-resistant" pocket is not safe for submersion and will let water in once you're below the surface.

Q: Isn't my phone already waterproof?
A: Most flagship phones carry an IP68 rating, but that's tested in still fresh water and isn't permanent. According to Apple's guidance, water resistance can decrease as a phone ages, and pool chlorine and salt water aren't part of the test. Treat the phone rating as a backup, not a swimming pass.

Q: What's the difference between IPX7 and IPX8?
A: IPX7 covers submersion to 1 meter for up to 30 minutes. IPX8 covers continuous submersion beyond 1 meter, which is what real swimming involves. For pool dives and ocean swims, IPX8 is the rating you want.

Q: Will a waterproof pocket protect things other than my phone?
A: Yes. A sealed dry pocket keeps key fobs, hotel key cards, cash, and cards dry too. These items have no water rating of their own, so the pocket is often protecting more than just your phone.