Best Faraday bags: phones, key fobs and laptops (2026)
A Faraday bag is a pouch lined with metal fabric that blocks radio signals, so a phone, key fob or laptop inside can't send or receive. People use them to stop a phone from being tracked, to keep a keyless car fob from broadcasting by the front door, and to store spare electronics. This page compares five Mission Darkness bags, from a key fob pouch to a 15-liter dry bag. We haven't tested them ourselves; the shielding figures are the maker's.
By Tom Calder · Updated October 30, 2026 · 5 products, prices indicative
Our picks
Mission Darkness phone bag
The phone bag most people need
Mission Darkness Dry Shield sleeve
A waterproof phone sleeve for a go-bag
Mission Darkness key fob 2-pack
Car keys at home
All 5 compared
| Bag | Made for | Inside size (maker) | Waterproof | Shielding (maker's claim) | Price |
|---|---|---|---|---|---|
Phones, key fobs, cards, passports · 5.5 x 9 in · Water-resistant · Blocks WiFi, Bluetooth, 5G, GPS, RFID and signals up to 40 GHz; MIL-STD-188-125 and IEEE 299-2006 (maker) The phone bag most people need | Phones, key fobs, cards, passports | 5.5 x 9 in | Water-resistant | Blocks WiFi, Bluetooth, 5G, GPS, RFID and signals up to 40 GHz; MIL-STD-188-125 and IEEE 299-2006 (maker) | |
Our verdictOur verdictResearched A simple, well-made phone pouch from the brand that publishes the test standards it's checked against. It cuts a phone off from cell, WiFi, Bluetooth and GPS signals, and at 5.5 by 9 inches inside it also takes key fobs, cards and a passport. Test it yourself: put your phone inside, roll the top closed twice and call it. It shouldn't ring. Best for The phone bag most people need Good
Worth knowing
Who shouldn't buy it: Don't buy it if you want to use the phone's screen while it's shielded. Read the full review → | |||||
Phones, smartwatches, key fobs · 7.5 x 4 x 0.5 in · Yes (maker) · Dual layers of TitanRF fabric (maker) A waterproof phone sleeve for a go-bag | Phones, smartwatches, key fobs | 7.5 x 4 x 0.5 in | Yes (maker) | Dual layers of TitanRF fabric (maker) | |
Our verdictOur verdictResearched The same shielding idea as the basic phone bag, in a waterproof sleeve with a magnetic closure, so it suits a go-bag, a boat or a truck. It's snug at 7.5 by 4 inches inside, which fits most phones but not much else. Best for A waterproof phone sleeve for a go-bag Good
Worth knowing
Who shouldn't buy it: Don't buy it if you want one bag for a phone, keys and cards together. Read the full review → | |||||
Car key fobs · Key-fob size · No · Blocks key fob signals (maker) Car keys at home | Car key fobs | Key-fob size | No | Blocks key fob signals (maker) | |
Our verdictOur verdictResearched A pair of small pouches for car key fobs, so a keyless-entry fob can't broadcast its signal while it sits by the front door. It's the cheapest thing on this page and the one most households actually use every day. Best for Car keys at home Good
Worth knowing
Who shouldn't buy it: Don't buy it if you need to shield a phone or tablet. Read the full review → | |||||
Laptops, tablets, several phones · 17 x 14 in · Water-resistant · Blocks low MHz to 40 GHz (maker) A laptop, tablet and spare phone together | Laptops, tablets, several phones | 17 x 14 in | Water-resistant | Blocks low MHz to 40 GHz (maker) | |
Our verdictOur verdictResearched A large flat bag, 17 by 14 inches inside, that takes even big laptops along with a tablet or a few phones. It's the size to pick if you want one bag for the household's electronics. It's priced like the specialist kit it is. Best for A laptop, tablet and spare phone together Good
Worth knowing
Who shouldn't buy it: Don't buy it if you only need to shield a phone. | |||||
Bulk storage: radios, phones, chargers · 15 liters · Yes (maker) · Two layers of TitanRF fabric (maker) A waterproof grab bag for spare electronics | Bulk storage: radios, phones, chargers | 15 liters | Yes (maker) | Two layers of TitanRF fabric (maker) | |
Our verdictOur verdictResearched A 15-liter waterproof dry bag lined with shielding fabric, big enough for a spare radio, an old phone, a power bank and chargers. If you keep backup electronics for emergencies, this keeps them dry and together in one place. Best for A waterproof grab bag for spare electronics Good
Worth knowing
Who shouldn't buy it: Don't buy it if you just want to stop a phone from being tracked. Read the full review → | |||||
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Before you buy
Match the size to what goes inside.
A phone bag that also takes keys and cards covers most needs; a laptop bag holds a laptop plus a tablet or phones; a dry tote holds a spare radio, power bank and chargers.
Test it at home.
Put your phone inside, close it the way the maker says (Mission Darkness's phone bag rolls twice and seals), and call it. If it rings, the bag isn't closed properly or isn't working.
Shielding claims are the maker's.
Mission Darkness cites MIL-STD-188-125 and IEEE 299-2006 testing and says test reports are available; many cheaper bags say 'military grade' with no standard named.
Waterproof and water-resistant aren't the same.
The Dry Shield sleeve and tote are made to be waterproof; the standard bags resist splashes only.
We verify every product's specifications against at least two independent sources, re-check its US price and stock on a schedule where we can track it automatically, and cross-check safety-relevant claims against official guidance. Every review is labeled Researched or Used and reviewed by us: where we've bought a product, or been sent it free, and used it ourselves, its review says which; where we haven't, our verdict is a considered spec-and-evidence comparison, not a hands-on test — and commissions never change a ranking either way. Read our full methodology →
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Common questions
Do Faraday bags really work?
For blocking signals, yes, if the bag is closed properly: a phone inside can't connect to cell, WiFi, Bluetooth or GPS. You can check one yourself by sealing your phone inside and calling it. It shouldn't ring.
Will a Faraday bag protect electronics from an EMP?
Some makers say so, but we haven't tested it and the claims are theirs. CISA, the federal agency that covers EMP, describes it as a threat to the grid and critical infrastructure and gives no guidance telling households to shield their electronics.
Do I need a Faraday bag for my car key fob?
If your car uses a keyless fob and you'd rather it didn't broadcast its signal from your hallway, a small fob pouch is a cheap fix. Many cars also let you turn off a fob's keyless function; check your owner's manual.
Can I use my phone inside a Faraday bag?
No. While it's sealed it can't make or take calls, get messages or show its location, which is the point. Take it out to use it.
Why is every bag on this page from Mission Darkness?
When we checked on October 26, 2026, Mission Darkness was the maker on Amazon US that named the test standards its bags are checked against, sold by the maker itself, with thousands of buyer ratings. Many cheaper bags say 'military grade' without naming a standard, and one popular pouch claimed health benefits we won't promote.