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Description
Why the Galaxy S21 Ultra Waterproof Case Is Essential for Divers and Outdoor Photographers
Picture floating above a reef, framing a shot with the best zoom camera Samsung had ever shipped — your Galaxy S21 Ultra fully underwater, fully dry inside its shell. This is not a beach-splash case; it is rated for full submersion to 20 ft / 6 m for a full hour. The Galaxy S21 Ultra Waterproof Case wraps your 6.8-inch flagship (2021) in a watertight, full-body sealed shell with a durable built-in screen protector, a lifted bumper around the display, an anti-slip hand grip, and military-grade drop testing from 12 ft / 3.6 m. Built for snorkelers, kayakers, beach photographers, construction workers, and parents of pool kids, this is the best Galaxy S21 Ultra waterproof case for anyone who wants the ultra-wide and 100x zoom cameras working in places phones are not supposed to go. The Gorilla Family does not wait out the weather — and now your S21 Ultra does not either.
Key Features
- 8 color choices: Clear, Green, Light Blue, Pink, Purple, Red, Teal, and White — every shade with the same watertight sealed shell.
- Premium materials: rigid polycarbonate front and back shells with a shock-absorbing TPU bumper and textured anti-slip grip panels.
- Case type: full-body, two-piece snap-together waterproof case forming a complete 360-degree watertight seal.
- 20 ft / 6 m submersion rating: fully submersible for up to 1 hour — triple the depth of typical IP68 cases.
- 12 ft / 3.6 m drop protection: military-grade standard tested — double head height onto hard surfaces.
- Built-in screen protector: a durable sealed front layer blocks water, sand, and scratches while keeping the 120Hz display responsive.
- Lifted display bumper: the raised perimeter keeps the screen off the ground on face-down landings.
- Anti-slip hand grip: textured sides prevent most drops before they happen — even with wet hands.
- Camera protection: sealed, optically clear lens windows keep the ultra-wide and telephoto cameras shooting sharp above and below the surface.
- Charging compatibility: Qi wireless charging works through the sealed back; USB-C hides behind a watertight plug. This is not a MagSafe magnetic case.
- Compatibility: fits the Samsung Galaxy S21 Ultra (6.8-inch, 2021) ONLY. It does NOT fit the Galaxy S21, S21 Plus, S21 FE, S20 Ultra, or S22 Ultra.
Materials Explained — What Polycarbonate and TPU Actually Feel Like
Polycarbonate is the same impact-resistant plastic used in bike helmets and aircraft cockpit windows. Here it forms the front and back shells — the pressure-resistant skeleton that keeps the watertight gasket sealed all the way down to 20 ft / 6 m and shrugs off impacts from rocks and concrete.
TPU (thermoplastic polyurethane) is the flexible, grippy material you know from running shoe soles and hockey puck rims. It forms the perimeter bumper that soaks up 12 ft / 3.6 m drops and the textured anti-slip panels that keep the big 6.8-inch phone planted in one hand.
The built-in screen protector feels close to the phone's own glass — thin enough that swipes and the 120Hz scroll stay fluid, tough enough to take the scratches sand and keys hand out.
Altogether the case weighs about 2.8 oz (79 g) and adds roughly 3.5 mm of thickness — honest, working bulk for a case rated to triple standard submersion depth.
Browse More Galaxy S21 Ultra Cases
Want to weigh this deep-water shell against metal armor, wallets, and slim covers? Browse our full Galaxy S21 Ultra cases collection, shop now and find the right protective phone case for your lifestyle.
Real-World Use Cases
- The Snorkeler: shoots reef video at depths that would void an ordinary IP68 case — 20 ft of headroom changes what counts as safe.
- The Kayaker: straps the phone to the deck for GPS, knowing a capsize and a slow recovery are both survivable.
- The Construction Worker: drops the phone from second-story framing — 12 ft is exactly the fall this case is tested for.
- The Beach Photographer: uses the S21 Ultra's zoom from the surf line, sand and spray be damned.
- The Gift-Giver: needs one gift for the person whose hobbies all involve water — eight colors close the deal.
Feature-to-Benefit Mapping
| Feature | Benefit |
|---|---|
| Watertight sealed shell | Fully submersible to 20 ft / 6 m for 1 hour |
| Military-grade tested bumper | Withstands drops from 12 ft / 3.6 m |
| Built-in screen protector | Blocks water, sand, and scratches with no extra accessory |
| Anti-slip grip texture | Prevents most drops before they start, even with wet hands |
| Sealed clear lens windows | Ultra-wide and 100x zoom shots stay sharp underwater |
Step-by-Step Installation Guide
- Clean your Galaxy S21 Ultra with a microfiber cloth so no dust or lint gets trapped under the built-in screen protector.
- Lay the phone face-down into the front shell, aligning the camera block and side buttons first.
- Snap the back shell on, pressing around the entire perimeter until every latch clicks — work corner to corner.
- Run a fingernail along the seam to confirm a complete seal, especially around the USB-C plug.
- Re-register your fingerprint, test buttons and speakers — and before any deep-water use, do a 30-minute paper-towel submersion test with the case empty.
Troubleshooting and Tips
- Fingerprint unlock less reliable after installation? Delete and re-register your prints with the case on — the ultrasonic sensor adapts to the membrane immediately.
- Touchscreen feels less responsive at first? Press gently around the screen edges to release trapped air; sensitivity settles within a day.
- Wireless charger not connecting? Center the phone precisely on the pad — the extra 3.5 mm makes alignment matter more.
- Muffled audio after the beach? Brush the acoustic membrane vents clear of sand with a dry soft brush — never poke them with anything sharp.
- How should I clean it? Rinse with fresh water after salt or chlorine exposure and wipe with a damp cloth — never use alcohol wipes on the coated shell, as they can cloud the finish.
FAQs
Which phones does this case fit?
It fits the Samsung Galaxy S21 Ultra (6.8-inch, 2021) only. It does NOT fit the Galaxy S21, S21 Plus, S21 FE, S20 Ultra, or S22 Ultra — the camera block and dimensions differ and the watertight seal will not close correctly.
What comes in the box?
The two-piece waterproof case (front shell with built-in screen protector plus back shell) in your chosen color, ready to install — no tools required.
How deep can it really go?
It is designed and tested for full submersion to 20 ft / 6 m for up to 1 hour — roughly three times the depth of a standard IP68 rating. It is not intended for scuba diving below that depth.
Can I take photos and videos underwater?
Yes — the sealed lens windows are optically clear, so the ultra-wide and telephoto cameras shoot sharp underwater. Use the volume key as a shutter, since touchscreens do not register input underwater.
What is the drop protection rating?
The case is military-grade standard tested to withstand drops from 12 ft / 3.6 m onto hard surfaces — double the typical pocket-height rating.
Does wireless charging work with the case on?
Yes — Qi wireless charging passes through the sealed back without opening the case. This is not a MagSafe magnetic case, so magnetic accessories will not snap on.
Does the in-display fingerprint sensor still work?
Yes — re-register your fingerprints after installation and the ultrasonic sensor reads reliably through the built-in protector.
Are the buttons and ports accessible?
Yes — sealed tactile covers keep power and volume clicking, and the USB-C port sits behind a watertight plug. Close the plug firmly before any water exposure.
Is the built-in screen protector responsive at 120Hz?
Yes — scrolling and gaming stay fluid. If sensitivity feels off at first, press out trapped air and give it a day to settle.
Does the case muffle the speaker?
Slightly — sealed acoustic membranes keep water out while letting sound through. Calls stay clear; music loses a touch of volume, the honest cost of a 20 ft seal.
Will the clear panels yellow over time?
The shells use an anti-yellowing, anti-scratch coating. Rinse off chlorine, salt, and sunscreen after use and store out of direct sun, and they stay clear.
Is it professional enough for the office?
Yes — the Clear or White options read as a sleek protective case in a meeting, not dive gear, and the grip texture is subtle.
Is this a good gift?
It is the obvious pick for the swimmer, angler, or boater in your life — eight colors and free 30-day returns make it an easy yes.
What is the return policy?
Yes — Gorilla Cases offers free 30-day returns on all Galaxy S21 Ultra cases. If the case doesn't fit your Galaxy S21 Ultra or you're not satisfied, contact our team within 30 days for a fast replacement or full refund. No restocking fees.
Should I test the case before deep-water use?
Yes — seal a paper towel inside the empty case and submerge it for 30 minutes. If the towel comes out dry, the seal is good. Repeat after any major drop or after opening the case.
Why Gorilla Cases?
Gorilla Cases exists because phones got expensive and life did not get gentler. The Gorilla Family trusts us because we drop-test every design, submersion-test every seal — this one to 20 ft — and describe honestly what a case can and cannot do, then back every order with free 30-day returns. Your S21 Ultra's cameras were built to go everywhere; now the rest of the phone can follow. Shop now at gorillacasestore.com
Read More From Gorilla Case Blogs
Want more full-body protection ideas for this phone? Read Samsung S21 Ultra Full Body Case, then see how a magnetic build with a built-in protector compares in Galaxy S21 Ultra Magnetic Case with Built-In Screen Protector.