The Best Faraday Bags of 2026

By Ian Freng
Updated November 12, 2026

A Faraday bag blocks radio signals like cellular, Wi-Fi, Bluetooth, GPS and RFID. People use them to protect car key fobs from relay theft, keep phones private and untrackable, and store backup electronics as part of an emergency plan. The best Faraday bags are tested to block signals across a wide range, seal reliably and hold up to repeated use.

Best Faraday bags compared

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How I picked these

I’ve been into preparedness and survival for 13 years and spent 20 years hiking and 16 backpacking, and I’ve owned and used a lot of gear in that time. I know what works when it matters and what’s just marketing.

I compared these Faraday bags on signal-blocking performance claims and testing, closure design, durability, water resistance and size options. Picks are based on that experience, manufacturer specifications and long-term owner feedback.

1. Mission Darkness NeoLok: best for phones

Mission Darkness is a leading Faraday bag brand used by law enforcement for evidence, and the NeoLok phone bag blocks cellular, Wi-Fi, Bluetooth and GPS when sealed properly.

Where it falls short: it’s sized for phones only.

2. Mission Darkness Dry Shield: best waterproof

The Dry Shield adds a waterproof roll-top to Mission Darkness’s Faraday shielding, making it great for go-bags and outdoor use.

Where it falls short: it’s bulkier than phone pouches.

3. SLNT Faraday Dry Bag: best for everyday carry

SLNT makes Faraday bags that look like regular gear, which makes them easy to use every day for privacy and travel.

Where it falls short: it costs more than basic pouches.

4. Mission Darkness X2 Duffel: best for large gear

For storing several devices, like a laptop, radios and backup drives, the X2 duffel provides large-capacity shielding.

Where it falls short: it’s expensive.

5. OFFGRID Faraday Bag: best budget

OFFGRID’s phone bags are an affordable way to block signals to phones and car key fobs.

Where it falls short: durability is below Mission Darkness.

What can it protect?

• Car key fobs: blocks relay attacks used to steal keyless cars.
• Phones: blocks tracking, calls and data for privacy.
• Credit cards and passports: blocks RFID skimming.
• Backup electronics: radios, drives and flashlights stored for emergencies.

How to test your bag

• Put your phone inside, seal the bag exactly as directed, and call it. It shouldn’t ring.
• Check that Wi-Fi and Bluetooth devices disconnect.
• Hold a key fob in the sealed bag next to your car; it shouldn’t unlock.
• Re-test periodically: folds and wear can create gaps.

EMP preparedness

Some preppers store backup electronics in Faraday bags or nested metal containers to protect them from electromagnetic pulses. How much protection any bag provides against a large EMP is hard to verify at home. Look for brands that publish lab test results, use multiple layers and keep spare essentials, like a radio and flashlight, stored separately.

Make a simple family emergency plan

• Agree on a meeting place near home and one outside your neighborhood.
• Choose an out-of-area contact everyone can check in with.
• Store at least three days of water and food per person, plus pet supplies.
• Keep copies of important documents and some cash in your kit.
• Review your plan and rotate supplies every six months.

Protecting your car from key fob theft

• Store key fobs in a Faraday pouch at home and when out.
• Keep keys away from doors and windows.
• Check whether your fob has a sleep or disable mode.
• Use a steering wheel lock as an extra visible deterrent.

Practice before you need it

Gear only helps if you know how to use it under stress. Test your equipment at home and on camping trips: run your power station through a night, start a fire with your ferro rod, use your radios on a hike, and pack and carry your go-bag around the block. Practice turns gear into real preparedness.

Faraday bag FAQ

Do Faraday bags really work?

Quality bags that are sealed properly block cellular, Wi-Fi, Bluetooth and GPS. Test yours with a phone call.

Can I use a Faraday bag for my car keys?

Yes. It blocks the signal relay attacks use to steal keyless cars.

Does a Faraday bag protect against EMP?

It can help protect stored electronics, but real-world EMP protection is hard to test at home.

Can my phone get damaged in a Faraday bag?

No, but it may drain its battery searching for signal. Turn it off for long storage.

Is aluminum foil a Faraday cage?

Multiple layers of foil can block signals, but it tears easily. A purpose-made bag is more reliable.

Do Faraday bags block GPS tracking?

Yes, when sealed properly, they block GPS, cellular and Wi-Fi signals to devices inside.

Which Faraday bag should you buy?

The Mission Darkness NeoLok is the best Faraday bag for phones and key fobs. Choose the Dry Shield for go-bags, SLNT for everyday carry, and the X2 duffel for storing larger electronics.