Spotlight: waterproof Faraday bag
SLNT Faraday Dry Bag, Waterproof Roll-Top Faraday Bag, 2.5L, 5L and 10L
If you want one bag that keeps a phone, radio or backup drive both dry and dark, this is the one we point people to. It is a roll-top dry bag rated to be submerged, with SLNT's tested Faraday lining inside, in three sizes from glove box to day bag. Independent reviewers soaked it, rained on it and tried to call through it, and it held up every time. We liked SLNT's gear enough to make it the only Faraday brand we carry.
Why it earns the spotlight
Dry and dark in one bag
Most Faraday bags block signals but not water, and most dry bags keep out water but not signals. This one does both: RF-welded seams and 420D waterproof nylon, rated to be submerged to 10 feet for up to 30 minutes.
Shielding with published test data
The Multishield lining is rated at more than 100 dB and tested to MIL-STD-188-125-2 and IEEE 299-2006 from 1 to 40 GHz. In CAT Outdoors' testing, a two-way radio inside got zero reception from 12 inches away, a phone could not take a call and an AirTag vanished from Find My.
A roll-top that is hard to get wrong
Seal the top, roll it down three times and clip it. The same motion that keeps water out closes the Faraday cage, so there is no fiddly hook-and-loop flap to misalign.
Built to carry, not just store
A detachable 55 inch sling strap, a MOLLE loop for a light or bottle, an exterior zip pocket for cards and cash, and an optional padded insert to keep devices from knocking together.
Goes through airport security with you
Faraday bags are allowed through airport security, and the Multishield lining blocks radio signals, not X-rays, so the Dry Bag screens like any other bag in your carry-on. Through crowded terminals and on the plane, your phone, passport and cards stay sealed where nothing can ping, track or scan them.
Specifications
- Sizes
- 2.5 L, 5 L and 10 L
- Inside, 2.5 L
- 8.25 x 4.75 x 4.75 in: a phone, a radio, keys and a power bank
- Inside, 5 L
- 9.84 x 5.51 x 5.51 in: two phones, a radio, a power bank and a backup drive
- Inside, 10 L
- 11.02 x 6.69 x 6.69 in: a household's phones, radios and chargers
- Exterior
- 420D waterproof nylon, RF-welded seams
- Lining
- SLNT Multishield Faraday material
- Shielding
- 100 dB+ (SLNT rating): cellular, WiFi, Bluetooth, GPS, RFID, NFC
- Test standards
- MIL-STD-188-125-2 and IEEE 299-2006 (1 to 40 GHz)
- Waterproofing
- Submersible to 10 ft (3 m) for up to 30 minutes
- Closure
- Roll-top: seal, roll three times, clip
- Hardware
- Duraflex UTX buckles
- Strap
- Adjustable and detachable, 55 in (139.7 cm)
- Extras
- MOLLE loop, exterior zip pocket (not shielded), optional padded insert
- Weight
- 0.56 lb (2.5 L), 0.62 lb (5 L), 1 lb (10 L)
- Warranty
- 1-year limited warranty from SLNT
What reviewers say
From people who have put it through hard use.
It's sleek, tough, and genuinely effective at keeping your gear dry and off the grid.
Through it all, the inside stayed totally dry.
Not just sleek and effective, but surprisingly affordable.
The SLNT Dry Bag is top-tier and did exactly what we wanted it to do.
Which SLNT bag to buy
Every one uses the same Multishield lining and roll-top seal. Pick by what you need to carry.
-
SLNT Faraday Dry Bag, 2.5 L, 5 L or 10 L
The one most people should buy. Choose the size above; the 5 L is the size both reviewers tested.
$54.95You're looking at this one -
A slim, submersible roll-top sized for a single phone, with a wrist strap.
$44.95 -
The same submersible build in a flat 6 L shape for a laptop, with a shoulder strap and MOLLE loop.
$99.95 -
Waterproof Faraday Backpack 20L Expanded
A submersible backpack with a fully shielded main compartment. It comes with a 2.5 L Faraday Dry Bag.
$299.95 -
Forty liters of shielded, submersible space for a household's electronics.
$299.95 -
Sized for storing power banks and portable generators at home.
$239.95
How it compares
Every bag here uses the same SLNT shielding. The Dry Bag is the most versatile of them: small enough to live in a go bag or glove box, big enough for several devices, and sealed against water as well as signal. Step up to the backpack or duffel for more room, or to the EMP bag for storing larger power gear at home.
| Bag | Capacity | Carry | Water protection | Best for | Price |
|---|---|---|---|---|---|
| SLNT Faraday Dry Bag | 2.5, 5 or 10 L | Sling strap | Submersible | Grab-and-go devices | $54.95 |
| Waterproof Faraday Phone Bag | One phone | Wrist strap | Submersible | A single phone | $44.95 |
| Faraday Laptop Dry Bag | 6 L | Shoulder strap | Submersible | A laptop | $99.95 |
| Waterproof Faraday Backpack 20L | 20 L | Backpack | Submersible | A full day's load | $299.95 |
| Waterproof Faraday Duffel 40L | 40 L | Duffel | Submersible | A household's electronics | $299.95 |
| EMP Faraday Bag | 67 or 230 L | Carry straps | Weatherproof | Generators and power banks at home | $239.95 |
Where it fits
Go Bag
Keeps the phones, radio and backup drive in a go bag dry and dark until you need them, across a creek or through a downpour. Coming soon as an option when you build your Go Bag.
Stay Home Kit
A home for the spare phone, radio and documents drive through an outage or storm, sealed against water and rated by SLNT to shield against EMP and solar flares. Coming soon as an option in the Stay Home Kit.
Get Home Bag
Rides in the car with your Get Home Bag, so a backup phone and radio stay dry on a wet walk home. Coming soon as an option in the Get Home Bag.
Air travel
Goes through airport security in your carry-on and keeps phones, passports and cards sealed in terminals, hotels and rental cars.
Questions people ask
Does the SLNT Faraday Dry Bag really block signals?
Yes. SLNT rates the Multishield lining at more than 100 dB, tested to MIL-STD-188-125-2 and IEEE 299-2006. CAT Outdoors put a two-way radio inside and transmitted from 12 inches away with zero reception. A phone inside could not receive a call, and an AirTag disappeared from Find My.
Why does Sagamore Trading carry SLNT?
We compared the Faraday brands we could carry and liked SLNT enough to drop the others. It publishes its shielding test data, its gear holds up in independent testing, and it is built to be carried every day, not just stored. We are adding SLNT bags as options in our Get Home Bag, Stay Home Kit and Go Bag soon.
Is it really waterproof?
Yes. It is RF-welded 420D waterproof nylon, rated to be submerged to 10 feet for up to 30 minutes when the top is rolled three times and clipped. CAT Outdoors left it under a sprinkler and walked it through the rain, and the inside stayed dry.
How do I seal it properly?
Put devices in the main compartment, press the top edges together so the lining meets across the full width, roll the top down three full turns and clip the buckles. Then call the phone inside. It should go straight to voicemail.
Which size should I get?
The 2.5 L holds a phone, a radio and keys. The 5 L, the size most reviewers test, adds room for a second phone, a power bank and a backup drive. The 10 L suits a household's phones, radios and chargers.
Can I take the SLNT Dry Bag through airport security?
Yes. Faraday bags are not on the TSA's prohibited list, so you can carry the Dry Bag on or check it. The Multishield lining blocks radio signals, not X-rays, so it goes through the scanner like any other bag. As with any carry-on, an officer may ask you to open it, and laptops and large electronics follow the normal screening rules for your lane.
Can I keep my phone in it on the plane?
Yes. A phone sealed in the Dry Bag cannot connect to anything, which also stops the Bluetooth and background pings airplane mode can leave on. Take it out when you want to use it, and roll the top three times again when you put it back.
What should I seal in it when I travel?
Your phone and any backup phone, your passport and cards, car and house keys, and a power bank. In a terminal, hotel or rental car, anything inside the sealed main compartment cannot be located, skimmed or connected to.
Will it protect electronics from an EMP or solar flare?
SLNT rates the lining to shield against EMP, high-altitude EMP and solar flares, and the material is tested to MIL-STD-188-125-2, a military standard for EMP shielding. Seal it fully, and store devices powered off.
Can I use or charge my phone while it is inside?
No. Once the bag is sealed, nothing inside can send or receive a signal. Take the device out to use it, and power it off or switch on airplane mode before longer storage.
What is the outside pocket for?
The zippered exterior pocket is for cards, cash or a pen. It is not shielded, so anything that should stay dark goes in the main compartment.
Who makes it?
SLNT, formerly Silent Pocket, which holds patents on its Silent Pocket Faraday cage design. The bag carries SLNT's 1-year limited warranty.