I’ll be honest: when I first started recommending Faraday bags to clients, most of them thought I was being paranoid. “It’s just my phone,” they’d say. “Who cares if it pings a cell tower?”
After 25 years in cybersecurity, including over a decade working with federal agencies, I care. Not because I’m paranoid, but because I’ve seen exactly how much data collection is technically possible. And I’ve watched the gap between “possible” and “actually happening” shrink to almost nothing.
These days, I test every Faraday bag I can get my hands on. Not for work anymore, but because people keep asking me which ones actually work. Turns out, about 30% of what’s sold online is garbage. Expensive phone sleeves with fancy marketing and zero actual shielding.
Here’s what I’ve learned from testing dozens of these things, and more importantly, when you actually need one versus when you’re just wasting money.
Quick Answer
A Faraday bag blocks electromagnetic signals using layers of conductive metal fabric that intercepts radio waves and prevents wireless transmission. When sealed properly, it stops all cellular, Wi-Fi, Bluetooth, GPS, RFID, and NFC signals from reaching devices inside through basic electromagnetic shielding principles. The conductive material creates an opposing field that cancels incoming signals, providing complete wireless signal isolation.
Quick Picks
After testing dozens of Faraday bags with RF meters and real-world scenarios, these are the products that deliver verified signal blocking across all major use cases.
- Phones: Mission Darkness Non-Window 2-Pack
- Key Fobs: Lanpard Key Fob Faraday Cage Protector
- Laptops: Mission Darkness Non-Window Faraday Laptop Bag
- Backpacks: OffGrid by EDEC Backpack
- EMP Protection: Faraday Defense Nest-Z EMP 10 Piece Kit
What Exactly Is a Faraday Bag?
A Faraday bag is a pouch or enclosure made with conductive material that blocks electromagnetic signals from reaching devices inside. Think of it as a signal-proof shield for your phone, key fob, credit cards, or anything else that broadcasts wirelessly.
The concept comes from Michael Faraday’s work in the 1830s. He discovered that a conductive enclosure blocks external electric fields from affecting what’s inside. Modern Faraday bags apply this same principle using layers of metal-infused fabric to stop radio waves from passing through.
When you seal a device inside a quality Faraday bag, it cannot send or receive any wireless signals. No cellular, no Wi-Fi, no Bluetooth, no GPS, no RFID. Complete isolation.
This isn’t just theory. The physics works every time, assuming the bag is made correctly and sealed properly. That second part is where most cheap bags fail.
How Faraday Bags Actually Work
Radio frequency signals are electromagnetic waves that travel through air. Your phone uses them, your car keys broadcast them, and your credit cards respond to them. These signals pass right through most materials like fabric, plastic, and leather without any problem.
Metal behaves differently. When electromagnetic waves hit conductive material, the electrons in the metal react by moving and creating their own opposing electromagnetic field. This opposition cancels out the incoming signal or at least weakens it enough that nothing gets through.
A quality signal blocking pouch uses multiple layers of conductive fabric to block signals across different frequencies. GPS signals are weak and easy to stop. Cell signals are stronger and need more RF shielding. Some newer car keys use ultra-wideband radio that can be trickier to block completely.
Most bags use a sandwich construction. The outer layer is regular fabric for durability. The middle layers contain the important stuff: fabric that’s been coated or woven with metal particles like copper, nickel, aluminum, or silver. Quality bags have at least two layers of this conductive material, sometimes three or four.
The seams matter just as much as the material. You can have perfect shielding fabric, but if your seams have gaps, signals leak through. Good bags use overlapping seams or conductive tape along the stitching. The closure mechanism needs to create overlapping barriers too. Roll-top closures work well. Velcro works if there’s enough overlap. Regular zippers need a fold-over flap.
If you want the full technical breakdown, check out how Faraday bags work for details on the physics and construction.
Types of Faraday Bags and What They’re Used For
Not all Faraday bags are the same. Different sizes and styles serve different purposes, and using the wrong type means you’re either over-protected or under-protected for what you actually need.
Phone Pouches
These are the most common type. Small pouches sized to fit smartphones, usually with room for one or two phones plus maybe your wallet.
I keep one in my car for when I need to actually disconnect. Meetings where phones aren’t allowed, situations where I don’t want location data recorded, times when I just need to know my phone isn’t broadcasting anything.
Phone pouches range from $15 to $50 depending on quality and features. The cheaper ones work fine for basic signal blocking. The expensive ones often have better materials, multiple compartments, or additional security features.
I’ve tested dozens of phone bags to find which ones actually block signals—here are the best Faraday bags for phones that passed my testing.
Key Fob Pouches
Smaller bags designed specifically for car keys. These became popular as relay attacks on keyless entry cars increased. Thieves use amplifiers to extend your key fob’s signal from inside your house to unlock your car in the driveway.
Signal blocking pouches for car keys prevent relay attacks by making your key fob’s signal undetectable. Drop your keys in the pouch when you get home, seal it, and your car stays protected overnight.
These run $15 to $30. Small investment compared to the hassle of a stolen car.
For my complete testing results and recommendations, see the best Faraday key fob protectors and how car key relay attacks work and why signal blocking matters.
Laptop and Tablet Bags
Larger bags for protecting laptops, tablets, and other bigger electronics. These are bulkier and more expensive, usually $50 to $150.
Journalists and lawyers use these for protecting sensitive information during travel. If your laptop can’t transmit, it can’t leak data about where you’ve been or who you’ve met with. Even when powered off, some devices can still ping networks or be remotely activated.
I don’t use one of these regularly. Most people don’t need this level of protection for everyday use. But for specific professional situations, they solve a real problem.
If you need laptop-sized protection, I’ve tested the top options—see the best Faraday laptop bags.
Credit Card Sleeves and Wallets
Small sleeves or entire wallets designed to block RFID signals from contactless credit cards, key cards, and transit passes. These operate at lower frequencies than phones, typically 13.56 MHz for NFC.
Card skimming is less common than people think, but it happens. Someone with an RFID reader in a crowded subway or concert could potentially grab your card data. A shielded wallet prevents this.
These cost $10 to $40 depending on size and capacity. I use one because why not? It’s the same size as a regular wallet and blocks one more attack vector.
Large Faraday Bags and Cases
Duffel-sized bags for protecting multiple devices at once. Law enforcement uses these for preserving digital evidence. Security professionals use them for transporting sensitive equipment.
These run $100 to $500 or more. Not something most regular people need, but critical for specific professional applications where verifiable signal isolation is required.
For larger capacity needs, check out the best Faraday backpacks I’ve tested.
When You Actually Need a Faraday Bag
Most people don’t need a Faraday bag for everyday use. But certain situations call for them specifically, and no other solution provides the same level of protection against electromagnetic interference.
Ready to find the right bag for your situation? I’ve narrowed down the options to the best Faraday bags for phones that actually deliver verified protection.
Preventing Car Theft
If you have a car with keyless entry, you’re vulnerable to relay attacks. This is documented, common, and happens in neighborhoods everywhere. The technology thieves use costs $100 to $300 online and requires no special skills.
A Faraday pouch for your keys solves this problem completely. The signal can’t escape the bag, so there’s nothing for relay devices to amplify. Simple physics beats sophisticated electronics.
I started using one after three cars got stolen in my neighborhood in two months. All keyless entry, all taken overnight from driveways. Pattern was obvious.
Protecting Sensitive Communications
Journalists working with confidential sources need verifiable wireless signal isolation. Same for lawyers with client data or investigators handling sensitive cases.
Airplane mode isn’t enough for this. Software can be manipulated, overridden remotely on compromised devices, or just fail due to bugs. A Faraday bag provides physical isolation that can’t be bypassed through software exploits.
You need to demonstrate that communication was impossible, not just unlikely. That’s the difference that matters in professional contexts.
For a detailed comparison of these two methods, Faraday bags vs airplane mode breaks down when each option makes sense.
Border Crossings and High-Surveillance Areas
Traveling through countries with aggressive surveillance capabilities? Some governments have the technical ability to activate devices that appear to be off. Airplane mode can potentially be overridden remotely.
A Faraday bag prevents any remote access or activation. The device is truly isolated from external signals. This matters when crossing borders or traveling through surveillance-heavy regions.
I’m not saying you need this every time you travel. But for certain destinations where device searches are routine and surveillance is known to be extensive, physical signal blocking provides control over what data is accessible.
Credit Card Protection in Crowded Areas
RFID skimming is real, though less common than the security industry sometimes claims. But if you’re in a crowded subway, concert, or tourist area, someone with an RFID reader could potentially grab your card data.
A shielded wallet blocks this completely. Same size as a regular wallet, no extra inconvenience, one less thing to worry about.
Privacy During Protests or Sensitive Meetings
Location data from phones has been used to identify protesters after the fact, even when phones were supposedly off. Law enforcement has used cell tower data to identify everyone in a specific area during certain times.
A phone in a Faraday bag can’t provide that data trail. It’s not about doing anything illegal. It’s about controlling what information you’re broadcasting about your location and associations.
This applies to sensitive business meetings too. Corporate espionage is real. If your phone can’t transmit, it can’t leak information about who attended a meeting or where it took place.
What Faraday Bags Actually Block
A well-constructed and sealed Faraday bag blocks all electromagnetic signals in the frequency ranges it’s designed for. Let me break down what that means in practice.
Cellular Signals
Cellular signals across all bands get blocked. 2G, 3G, 4G, 5G. Your phone can’t make calls, send texts, or use data. It also can’t ping cell towers, which is how location tracking often works even when you’re not actively using the phone. This is the most obvious function and what most people test first. Put your phone in the bag and try to call it. If it rings, the bag doesn’t work.
Wi-Fi Networks
Wi-Fi networks on both 2.4 GHz and 5 GHz frequencies get blocked. Your phone can’t connect to networks or broadcast its MAC address. Retailers and others use Wi-Fi MAC addresses for tracking people’s movement through stores and public spaces. Your device becomes invisible to Wi-Fi networks when properly bagged. No connections, no tracking, no data collection.
Bluetooth Connections
Bluetooth and BLE signals get stopped. Regular Bluetooth and Bluetooth Low Energy both get blocked completely. This prevents tracking through Bluetooth beacons and stops your device from connecting to other gadgets. BLE beacons are used extensively for indoor positioning and tracking in malls, airports, and large venues. A bagged device can’t be tracked this way.
GPS and Location Services
GPS and location services get blocked entirely. GPS signals from satellites can’t reach your device. Your phone can’t update its location and apps can’t access GPS data. This is different from network-based location services, which use cell towers and Wi-Fi. A Faraday bag blocks those too by cutting off the signals entirely. No signals in, no signals out, no location data.
RFID and NFC
RFID and NFC transmissions stop working. These short-range technologies used in contactless credit cards, key cards, and transit passes operate at lower frequencies, typically 13.56 MHz for NFC and various ranges for RFID. They’re actually easier to block than higher-frequency signals. Any decent Faraday bag stops them completely.
Car Key Fobs
Car key fobs can’t transmit through a proper bag. Key fobs usually operate around 315 MHz or 433 MHz depending on your region. A proper Faraday pouch blocks these frequencies and prevents relay attacks where thieves amplify your key signal. This is one of the most practical applications for regular people. Car theft prevention for $20 is pretty solid value.
These bags provide complete RF shielding across multiple frequency ranges. That’s what separates engineered Faraday bags from just wrapping your phone in aluminum foil and hoping for the best.
How to Test Your Faraday Bag
Testing is critical because marketing claims and actual performance are often different stories. I’ve tested dozens of these bags and found that about 30% of the ones I bought didn’t work as advertised.
Basic Phone Test
Simplest test: put your phone inside, seal the bag properly, and call it. If it rings, your bag doesn’t work. Period.
But that’s just testing cellular signals. Your phone might still be broadcasting Wi-Fi, Bluetooth, or GPS data. You need more comprehensive testing.
Multi-Signal Testing
Turn on Wi-Fi and Bluetooth on your phone. Put it in the bag and seal it. Try to connect to it from another device. Check if you can ping it on your home network. Use a Bluetooth scanner app on a second phone to see if your device shows up.
If any of these connections work, your bag is leaking signals. Either it’s poorly made or you’re not sealing it correctly.
GPS Verification
This is trickier to test directly. Put your phone in airplane mode and check which services still work. Then take it out of airplane mode, put it in the Faraday bag, and see if you get similar results.
If apps can still pull your location from the bag, something’s wrong. The bag should provide at least the same isolation as airplane mode, preferably more.
Car Key Test
Stand next to your car with the key in the sealed bag. Try to open the door. If it opens, the bag isn’t blocking the signal. Walk further away and try again at different distances.
A working bag should make your key completely undetectable. Your car should act like the key doesn’t exist.
Professional Testing
RF meters measure signal strength across different frequencies. These tools cost anywhere from $50 to several thousand dollars. Most people don’t need this level of testing, but it’s what manufacturers should use to verify their products.
If you’re serious about testing, a basic RF detector costs around $50 and will show you if signals are leaking. More expensive meters give you specific frequency data and signal strength measurements.
For detailed testing procedures and what to look for, how to test a Faraday bag covers different methods and tools.
How to Choose a Faraday Bag That Works
Buying the right bag means looking past marketing claims and checking actual construction details. Here’s what separates real protection from expensive fabric.
Verify Testing Data
Look for testing data. Good manufacturers provide actual test results showing signal attenuation across different frequencies. Not vague claims like “military grade” or “lab tested.” Real numbers showing how many decibels of RF shielding they provide at specific frequencies. If the product description doesn’t include this information, that’s a warning sign. Companies that do proper testing want to show their results.
Examine Construction Details
Check construction details. How many layers of conductive material? What specific metals are used? How are the seams sealed? These details tell you if the bag will actually work. Quality bags specify things like “three layers of copper-nickel fabric” or “aluminum-coated polyester with overlapping seam construction.” Vague descriptions like “advanced shielding material” mean they’re hiding something.
Read Real Reviews
Look for reviews that describe actual testing with specific methods. Skip reviews that just say “seems to work” or “great product.” You want people who tested with RF meters or at least did comprehensive phone tests. YouTube reviews can be helpful if the reviewer shows testing procedures. Watching someone use an RF meter on the bag gives you real data.
Match Bag to Purpose
A bag designed for phones might not shield car keys adequately. Different frequencies need different shielding approaches. Buy a bag that’s specifically designed for what you need to protect. Phone bags are usually optimized for higher frequencies. Key fob pouches focus on the lower frequencies car keys use. Using the wrong type might leave you unprotected.
Consider Size Carefully
Don’t buy a bag that barely fits your device. You need extra room because cramming your phone in tight can prevent proper sealing. A bag that’s slightly too large is better than one that’s slightly too small. The sealing mechanism needs space to work correctly. Overstuffing prevents proper closure and lets signals leak.
Check for Guarantees
Some manufacturers offer guarantees: if you can receive a call while your phone is sealed in their bag, they’ll refund your money. This shows confidence in their product and gives you recourse if it doesn’t work. No guarantee doesn’t automatically mean a bad product, but it’s a positive sign when offered.
Common Mistakes People Make
I’ve seen the same errors repeatedly, often from people who bought quality bags but used them incorrectly. Avoiding these will save you frustration and wasted money.
Not Testing When You First Get It
Test your bag as soon as it arrives. Run through the basic tests before you need the bag for anything important. Finding out it doesn’t work when you actually need protection is too late.
I had a client who bought three different bags over six months, never tested any of them, and discovered during a border crossing that none worked properly. That’s an expensive and stressful way to learn.
This takes maybe 10 minutes and tells you if you need to return it.
Improper Sealing
The bag needs to be sealed according to manufacturer instructions. A partially open Faraday pouch doesn’t work. Signals will leak through any gap.
Roll-top bags need to be rolled enough times. Velcro closures need full contact. Fold-over flaps need to be folded completely. Follow the instructions exactly.
I’ve watched people casually fold their bag closed without proper sealing, then complain it doesn’t work. The bag worked fine. The user didn’t.
Buying Based Only on Price
The cheapest bag on Amazon probably doesn’t work. But the most expensive one isn’t automatically better either. Price should be one factor among several, not the only consideration.
A $15 bag from a reputable manufacturer with good reviews beats a $50 bag with no testing data and vague descriptions.
Assuming One Bag Works for Everything
Different devices need different bags. A phone pouch might not adequately shield car keys. A credit card sleeve won’t fit your phone. Match the product to the specific use case.
Some bags are multi-purpose and handle various devices well. Others are specialized. Know what you’re buying.
Not Testing Regularly
Materials can degrade over time. The conductive coating can wear off or the seams can separate. Test your bag every few months to verify it still works.
This is especially important for bags you rely on for security. Regular verification ensures continued protection.
Maintenance and Care
Faraday bags need minimal maintenance, but a few practices keep them working properly longer.
Storage
Keep your bag in a dry place. Moisture can affect the conductive materials over time. Don’t leave it in humid environments or places where it might get wet.
I keep mine with my keys or in my bag. Somewhere I’ll actually use it, not buried in a drawer where I’ll forget about it.
Cleaning
Most bags can be wiped down with a damp cloth. Don’t machine wash them unless the manufacturer specifically says it’s safe. The agitation can damage the conductive layers.
Harsh chemicals can also affect the shielding material. Stick to water or very mild soap.
Checking for Damage
Inspect the bag periodically for tears, worn spots, or damaged seams. Any physical damage can create signal leaks. Small tears might not seem like a big deal, but they can compromise shielding.
If you find damage, test the bag to see if it still works. Depending on the location and size of the damage, it might still provide adequate protection or it might need replacing.
Replacement Timeline
Quality Faraday bags last years with normal use. I’ve had some for five years that still work perfectly. But heavy daily use or rough handling can shorten lifespan.
Budget for replacement every 3 to 5 years for regular use, sooner if you’re hard on your gear. The cost is low enough that replacing proactively makes sense if you’re unsure.
For more on longevity and when to replace your bag, how long Faraday bags last covers what affects lifespan and signs it’s time for a new one.
Understanding Your Threat Model
The biggest question is whether you actually need a Faraday bag. This depends entirely on your specific situation and what you’re trying to protect against.
Low-Risk Situations
Most people most of the time fall into this category. You just don’t want apps tracking your location constantly. You want to reduce distraction occasionally. You’re concerned about general privacy but not facing specific threats.
For these situations, airplane mode often works fine. A Faraday bag provides extra assurance but might be overkill for casual privacy needs. You’re dealing with ambient data collection, not targeted surveillance. The stakes are your personal preference, not security risks.
Medium-Risk Situations
You have a car with keyless entry in an area where car thefts happen. You occasionally handle sensitive information that shouldn’t be tracked. You travel internationally and cross borders where device searches occur.
For these situations, a Faraday bag makes sense. The risk is real enough and the protection is cheap enough that it’s worth having. You’re not paranoid, just prepared for documented threats that actually happen to regular people.
High-Risk Situations
You work with confidential sources or client data professionally. You’re in situations where location data could compromise others. You face active threats from sophisticated actors.
For these situations, a Faraday bag is necessary. No other option provides verifiable physical signal isolation that can’t be bypassed through software exploits. The consequences of signal leakage are serious enough that you need absolute certainty, not just probability.
Faraday Bags and the Law
Using a Faraday bag is legal everywhere. You’re allowed to control whether your devices transmit signals. This is no different from turning your phone off or putting it in airplane mode.
Some situations have specific rules. Airlines require airplane mode during flights. Some government facilities prohibit phones entirely. A Faraday bag doesn’t change these requirements. You still need to follow whatever rules apply to the location.
Using a Faraday bag to interfere with legal investigations or hide evidence is a different story. Obstruction of justice charges can apply if you’re deliberately hiding something from law enforcement with a valid warrant. But owning and using a Faraday bag for general privacy isn’t illegal.
At border crossings, you can use a Faraday bag, but officers can still ask you to remove devices and power them on. The bag doesn’t give you special rights. It just limits what data is accessible while the device is bagged.
Alternatives to Faraday Bags
A few other options exist for blocking signals, though each comes with significant tradeoffs that make them less practical than purpose-built bags.
Airplane Mode
Software-based solution that tells your phone to disable radios. Works fine for casual situations but requires trusting that the software actually does what it claims. Malware can override airplane mode settings. Some phones have been documented transmitting data even in airplane mode. Operating system bugs can cause radios to activate unexpectedly.
For casual privacy needs, airplane mode is sufficient. For situations where you need verifiable isolation, it’s not enough. For a full breakdown of when each option makes sense, Faraday bags vs airplane mode covers the differences and appropriate uses.
Metal Containers
Completely sealed metal boxes can act as Faraday cages. Cookie tins, ammunition cans, or purpose-built metal boxes. The problem is most containers have gaps at the lid that let signals through. Even tiny gaps can compromise shielding effectiveness.
These work in theory but need testing to verify. I’ve tested several metal containers. Some worked surprisingly well. Others leaked signals badly despite appearing sealed. They’re also bulky and impractical for daily use. You’re not carrying a metal ammunition can to meetings.
Aluminum Foil
Multiple layers of aluminum foil wrapped tightly with no gaps can block signals. But it’s fragile, tears easily, looks ridiculous, and needs constant replacement. Nobody uses this consistently. It’s a temporary hack, not a real solution.
That said, if you need emergency signal blocking and have nothing else, heavy-duty aluminum foil wrapped in at least six layers with no gaps can work. Test it first. And expect strange looks.
Disabling Features
Some cars let you disable keyless entry. Some phones let you disable location services entirely. This solves specific problems but requires giving up functionality you might actually want sometimes.
A Faraday bag lets you have both. Use the features normally, then block signals when you choose. Flexibility matters when your needs change based on situation.
Frequently Asked Questions
Let me address the questions I get asked most often about Faraday bags.
Do Faraday bags stop all signals?
A properly made and sealed Faraday bag blocks electromagnetic signals in the frequency ranges it’s designed for. This includes cellular, Wi-Fi, Bluetooth, GPS, RFID, and NFC. Some specialized signals might require specific shielding, but quality bags block everything most people need.
Can you still receive calls with a phone in a Faraday bag?
No. If your phone rings while properly sealed in a Faraday bag, the bag doesn’t work. Calls can’t get through because the signal is physically blocked. This is the simplest test of whether your bag functions correctly.
How long do Faraday bags last?
With normal use, quality bags last 3 to 5 years or more. Heavy daily use or rough handling can shorten this. Regular testing ensures your bag still works. Replace it if you find damage or if it stops blocking signals.
Do Faraday bags damage devices?
No. Faraday bags are passive shielding. They don’t generate any signals or fields that could harm electronics. Your device functions normally. It just can’t communicate wirelessly while inside.
Can TSA see through Faraday bags at airports?
X-ray machines at airport security see through Faraday bags the same way they see through any fabric bag. The conductive material might appear slightly different on the scan, but security can still see what’s inside. You’ll likely need to remove devices from the bag for scanning anyway.
Will my phone battery drain faster in a Faraday bag?
Possibly. Your phone keeps searching for signals when it can’t connect. This can use more battery than normal. The effect varies by device and settings. Turning your phone off before bagging it prevents this issue for longer storage.
Can I make my own Faraday bag?
You can try, but getting it right is harder than it looks. You need the right conductive material, proper seam construction, and effective closure. Testing is critical because homemade versions often have gaps that leak signals. For most people, buying a verified product makes more sense.
Do Faraday bags work for car keys?
Yes, but you need a bag designed for the frequencies car keys use, typically 315 MHz or 433 MHz. Phone bags might not adequately shield these lower frequencies. Get a key fob specific pouch and test it with your car.
Are expensive Faraday bags better than cheap ones?
Not always. Price doesn’t guarantee performance. Some expensive bags have better materials or construction, but some are just overpriced. Look for testing data and construction details rather than price. A $20 bag with verified test results beats a $60 bag with no data.
Can police track my phone if it’s in a Faraday bag?
No. A properly sealed Faraday bag prevents all wireless tracking. The phone can’t ping cell towers, connect to networks, or transmit GPS data. Physical isolation stops tracking completely while the device is bagged.
Making the Right Choice for Your Situation
These bags aren’t magic. They’re just metal fabric that blocks radio waves through basic physics. They work when made correctly and sealed properly. They fail when cheaply constructed or improperly used.
The question isn’t whether Faraday bags work. They do. The question is whether you have situations that require one.
Car theft prevention? Yes, you need one for your keys. Sensitive professional work with confidential information? Yes, get a phone pouch. General privacy concerns but no specific threats? Maybe airplane mode is enough.
Most people don’t need a Faraday bag for everyday use. But for specific situations, they’re the only real solution. Software can be manipulated. Airplane mode requires trust. Physical signal blocking is verifiable and reliable.
I keep a phone pouch in my car and a key fob pouch by my front door. I don’t use them constantly. But when I need them, nothing else provides the same certainty.
The choice is yours. Just make it an informed choice based on understanding what these bags actually do and when they’re necessary. Don’t overthink it, but don’t under-protect either.
Ready to find one that actually works? I’ve tested dozens of bags and narrowed it down to the ones that consistently perform. Check out my detailed reviews of the best Faraday bags to see which options deliver real protection for your specific needs.
Test it when you get it. Use it when you need it. And remember that control over your signal is control over your data. That’s worth having when it matters.