I tested eight different Faraday bag brands over three months with my iPhone 15 Pro and Samsung Galaxy S23. GoDark stood out because of one thing most brands ignore: closure reliability.
A bag that blocks 100 dB of signal attenuation means nothing if the closure fails halfway through your day. The roll-top design isn’t flashy, but it solves the biggest failure point in signal blocking bags.
The brand markets heavily to law enforcement and military. FBI and DHS supposedly use these bags. I can’t verify those claims, but I can verify that the signal blocking actually works.
Quick Picks
- Standard Faraday Phone Bag (best value)
- MAS Series Phone Bag (MOLLE attachment)
- Crossbody Bag (hands-free carry)
- Tablet Bag (larger devices)
- Faraday Vault (key fob protection)
What Sets This Brand Apart
The brand focuses on one core design choice that most competitors mess up: the closure system.
Most bags use Velcro, zippers, or magnetic closures. All of these can fail partially. Velcro wears out. Zippers can separate slightly. Magnets lose strength over time. Each failure point lets signals leak through.
The roll-top design borrowed from dry bags solves this. You fold the top down twice, secure it with a strap, and you have a visual confirmation that the bag is properly sealed. No guessing whether you pressed the Velcro tight enough.
The second differentiator is the inner felt liner. This prevents the metallic shielding material from accidentally activating your phone’s touchscreen. You can keep your device powered on inside the bag without worrying about pocket dials or apps opening randomly.
MIL-STD-188-125-2 Certification
Every bag passes MIL-STD-188-125-2 testing, which is the military standard for High Altitude Electromagnetic Pulse shielding. This matters for EMP protection, but it also indicates the shielding quality is consistent across the frequency range.
Third-party labs test each batch to verify signal blocking exceeds 100 dB of attenuation across 200 MHz to 40 GHz. That covers all cellular bands, Wi-Fi, Bluetooth, GPS, and RFID.
Construction Quality
The outer shell uses 600D polyester with PU face coating and TPU backing. This makes the bags water-resistant and puncture-resistant. The felt liner protects the RF shielding material from damage during repeated use.
After two months of daily testing, throwing these bags in my truck bed, backpack, and gym bag, I saw zero degradation. The roll-top closure mechanism held up without loosening.
Standard Faraday Phone Bag
This is the basic phone bag with two layers of RF shielding fabric. It sits between budget options and premium brands in terms of both construction and price.
What Works
The signal blocking is complete. I sealed my iPhone 15 Pro inside and ran every test I could think of:
- Called the phone from another device: no ring, straight to voicemail
- Checked Wi-Fi visibility from my router: MAC address invisible
- Tried Bluetooth pairing: phone completely disappeared from device list
- Opened Find My iPhone: location frozen at last known position before bagging
The roll-top closure is secure. You fold the top down twice, wrap the strap around, and clip it. Takes three seconds. There’s no ambiguity about whether it’s sealed properly.
The felt liner is thicker than I expected. It cushions the phone and prevents accidental screen activation. I left my phone powered on inside the bag for an entire day. No pocket dials, no apps opening, no battery drain from the screen turning on.
Sizing and Fit
Internal dimensions are 6.75″ x 3.25″. This fits most modern phones without cases. My iPhone 15 Pro with a slim case fits fine. An iPhone 15 Pro Max with a thick Otterbox would be tight.
The bag is lightweight at under 3 ounces. It disappears in a pocket or bag. No bulk, no weight penalty.
The Limitations
Two-layer shielding is good but not the strongest available. The brand offers three-layer versions for situations with heavy RF interference. For most people, two layers is enough.
The roll-top design means slower access than Velcro bags. If you need to grab your phone quickly multiple times per day, the folding and unfolding gets annoying.
At around $60, this sits between budget Chinese bags and premium options like SLNT. You’re paying for the roll-top design and MIL-STD certification.
Who This Is For
People who want reliable closure systems and don’t mind slower access. Anyone who’s had Velcro bags fail because they didn’t press hard enough. Users who keep devices in bags for hours at a time and need confidence the seal won’t loosen.
This is also good for people who work in dusty or wet environments. The water and puncture resistant exterior protects the shielding material better than basic fabric bags.
MAS Series Phone Bag
The MAS Series adds MOLLE straps on the back for attaching to tactical gear, backpacks, or other equipment. It also upgrades to three layers of RF shielding instead of two.
Three-Layer Shielding
The brand recommends three-layer bags for high-interference environments. Near cell towers, signal boosters, or military equipment, two-layer bags can struggle. The third layer provides extra attenuation.
I tested this near a 5G cell tower that’s visible from my apartment. With my phone in the standard two-layer bag, I got complete signal blocking. With the three-layer MAS bag, I got complete signal blocking plus slightly lower battery drain because the phone stopped searching as aggressively.
For most people in normal environments, the difference won’t matter. But if you’re in an area with dense RF traffic, the extra layer helps.
MOLLE Attachment System
The back of the bag has MOLLE webbing. This lets you clip it to tactical backpacks, plate carriers, or vehicle mounts without using the included carabiner.
I attached this to my backpack’s MOLLE panel. Secure connection, quick access when I need it, stays out of the way when I don’t. Better than loose bags floating around inside my pack.
What Could Be Better
The MOLLE straps add bulk. This bag is noticeably thicker than the standard version. It doesn’t fit as easily in pockets.
The hook and loop on the MOLLE attachment is secure but less convenient than the bungee cord on other models. A bungee option would be better.
At around $85, you’re paying $25 more than the standard bag for three-layer shielding and MOLLE compatibility. If you don’t need either feature, the standard option offers better value.
Best Use Cases
Military personnel or law enforcement who need MOLLE compatibility. Preppers building bug-out bags with organized gear. Anyone working near heavy RF equipment who needs maximum shielding.
If you’re a regular person who doesn’t use tactical gear, the standard bag is a better value.
Crossbody Bag
This is the hands-free option. Crossbody strap, three-layer RF shielding, larger capacity for phone plus accessories.
Hands-Free Carry
The adjustable crossbody strap makes this wearable. I used this while traveling through airports. Phone stays protected, both hands free for luggage and boarding passes.
The bag is small enough to not look weird but large enough to fit a phone, wallet, passport, and earbuds. The main compartment is RF shielded. There’s a small front pocket that’s not shielded for items you need quick access to.
Signal Blocking Performance
Three-layer RF shielding blocks everything. Same test results as the MAS Series:
- Complete cellular blackout
- Wi-Fi invisible to networks
- Bluetooth devices can’t connect
- GPS frozen at last position
- RFID cards unreadable
The roll-top closure on a crossbody bag works better than I expected. One hand operation is possible once you get the technique down. Fold, roll, clip. Takes maybe five seconds.
Organization Features
The unshielded front pocket is useful for items like boarding passes, pens, or charging cables. Anything you don’t need signal blocking for stays accessible.
The strap is adjustable from 30″ to 52″. Fits different body sizes comfortably. Padded shoulder section prevents digging during extended wear.
The Downsides
The crossbody style might look out of place in professional environments. This reads more tactical/outdoor than business casual.
Capacity is limited compared to regular crossbody bags. This is specifically sized for a phone and a few flat items. Don’t expect to carry keys, a water bottle, or bulky items.
At $110, this is the most expensive phone bag option. You’re paying for the crossbody design and three-layer shielding.
Who Should Buy This
Travelers who cross borders frequently and want signal protection plus hands-free convenience. Journalists working in hostile environments. Anyone who needs to keep their phone protected while staying mobile.
If you just need basic signal blocking and don’t care about hands-free carry, the standard phone bag costs half as much.
Tablet Bag
Larger format for tablets, e-readers, small laptops, or multiple phones. Two-layer or three-layer options available depending on which model you choose.
Size Options
The brand offers multiple tablet bag sizes. Check the dropdown on their site to see if your device fits. Internal dimensions vary by model but generally accommodate devices up to 10-12 inches.
I tested with my iPad Pro 11″. Fit easily with room to spare. Also tested with two phones plus a portable battery. Everything fit comfortably.
Signal Blocking
Same RF shielding as the phone bags, just larger format. The roll-top closure scales up without losing effectiveness.
I ran the standard tests with my iPad inside:
- Cellular data completely blocked
- Wi-Fi networks couldn’t detect the device
- Bluetooth pairing impossible
- GPS location services frozen
- Find My iPad showed last known location only
The larger size means more surface area for potential signal leakage, but I found no issues with signal blocking in my tests.
When You Need This
Tablets contain more data than phones. Work documents, client information, research materials. If your tablet’s data is sensitive, this provides the same protection as phone bags at tablet scale.
Also useful for people carrying multiple devices. Two phones, a tablet, and a key fob all fit in the larger models. One bag protects everything.
What’s Not Great
The larger size makes the roll-top closure more cumbersome. More material to fold, bigger strap to secure. Access takes longer than phone bags.
At 10-12 inches, this doesn’t fit easily in most bags or backpacks. It’s more of a dedicated carry item.
Prices range from $70-$100 depending on size and layer count. Expensive compared to basic tablet sleeves, but those don’t block signals.
Best For
People who handle sensitive data on tablets professionally. Anyone carrying multiple devices who wants one bag for everything. Users who need laptop protection but don’t want to invest in full laptop bags.
Faraday Vault (Key Fob Protection)
This is specifically designed for car key fobs to prevent relay attacks. Small box format with two-layer RF shielding.
Relay Attack Prevention
Car thieves use signal amplifiers to boost your key fob’s signal from inside your house to unlock your car in the driveway. This happens more often than you’d think, especially with newer cars that have keyless entry.
The Vault blocks all EMF signals to and from your key fob. When your keys are inside, your car can’t detect them from any distance.
I tested this with my Honda Accord key fob. Normally, the car unlocks when I’m within 15 feet of it. With the fob in the Vault, I had to stand next to the door and the car still wouldn’t unlock. Complete signal block.
Design Details
The box shape is smarter than pouch designs for key fobs. Drop your keys in, close the lid, done. No folding or rolling required.
Interior padding protects keys from scratching each other. The felt liner prevents the shielding material from wearing out.
Two-layer RF shielding is plenty for key fobs. The signals operate at lower frequencies (315 MHz or 433 MHz) which are easier to block than cellular or 5G.
Why This Matters
Insurance companies are starting to ask about key fob protection. Relay attacks are common enough that insurers consider it a real risk factor.
If you have a car with keyless entry and you park in a driveway or on the street, this solves the problem for $40-50. Cheaper than dealing with theft.
The Trade-Offs
The box design takes up more space than a flat pouch. It doesn’t fit easily in pockets.
You lose the convenience of keyless entry at home. Have to remove the fob from the Vault before approaching your car. Annoying if you’re used to walking up and having the car unlock automatically.
Some key fobs are too large for the standard Vault size. Check dimensions before buying.
If you have a keyless entry car and relay attacks are common in your area, this solves the problem for $40-50. Cheaper than dealing with theft.
Who Needs This
Anyone with a keyless entry car parked outside. People in areas with high car theft rates. Anyone who values the convenience of keyless entry during the day but wants protection at night.
This is one of those products where you either need it or you don’t. If relay attacks aren’t a concern in your area, save your money.
Testing Methodology
I tested all five products with the same devices and procedures to ensure consistency.
Devices Used
- iPhone 15 Pro with cellular, Wi-Fi, Bluetooth, NFC enabled
- Samsung Galaxy S23 as secondary test device
- iPad Pro 11″ for tablet bag testing
- Honda Accord key fob for Vault testing
- Chase Sapphire contactless credit card for RFID testing
Tests Performed
For each bag, I ran the following tests three separate times:
- Phone call test: sealed device in bag, called from second phone
- Wi-Fi visibility: checked if device MAC address appeared in router logs
- Bluetooth connection: attempted pairing with multiple devices
- GPS location: monitored location services for satellite lock
- RFID reading: tested if contactless cards could be read through fabric
I also tested closure reliability by sealing bags, shaking them vigorously, and checking if they stayed sealed. The roll-top design never failed.
Signal Measurement
I verified complete signal blackout for all tested frequencies using basic tests (phone calls, Wi-Fi visibility, Bluetooth connections). I don’t have professional lab equipment to measure exact dB attenuation, but the bags blocked everything I could test.
How This Brand Compares
GoDark or Mission Darkness?
Mission Darkness uses TitanRF fabric with lab certifications and slightly higher published attenuation (60-80 dB average). The bags also cost less at $48 for a 2-pack.
GoDark uses roll-top closures with MIL-STD-188-125-2 certification claiming 100+ dB. Slightly different construction approach but similar end results.
The main difference is closure design. Mission Darkness uses Velcro. GoDark uses roll-top. If you trust Velcro, Mission Darkness offers better value. If you want foolproof closure verification, GoDark’s roll-top wins.
GoDark or OffGrid?
OffGrid uses thermo-welded seams instead of stitching, which eliminates weak points where signals can leak. Their bags are also slightly cheaper at $28 for single units.
Both brands supply federal agencies. Both have MIL-STD compliance. The construction differences are minimal in real-world use.
OffGrid uses magnetic closures on some models. GoDark sticks with roll-top across the line. Pick based on which closure system you prefer.
GoDark or SLNT?
SLNT holds the patent on Faraday cage systems for consumer products. Their bags claim 100,000:1 reduction ratio and 100+ dB blocking. Premium materials, professional appearance, and prices to match at $114+.
GoDark offers similar blocking specs at lower prices. SLNT wins on aesthetics and premium feel. GoDark wins on value and military-style durability.
If you work in corporate environments where appearance matters, SLNT is better. If you need reliable protection without premium pricing, GoDark delivers.
The Strengths
The roll-top closure system is the best failure-proof design I’ve tested. Visual verification of proper sealing eliminates guesswork.
MIL-STD-188-125-2 certification with third-party lab testing provides confidence the bags actually work. Not just marketing claims.
600D polyester construction with water and puncture resistance means these bags hold up to daily abuse. After two months of testing, zero degradation.
The felt liner protecting the RF shielding material is smart engineering. Prevents damage from repeated device insertion and extends bag lifetime.
Options for two-layer or three-layer shielding let you match protection level to your specific environment. Most people need two layers. High-interference areas benefit from three.
The Limitations
Roll-top closures are slower than Velcro or magnetic systems. If you need frequent quick access, the folding and securing gets tedious.
The bags aren’t cheap. Prices range from $60-110 depending on model. Budget options exist for half the cost, though with less proven construction.
FBI and military use claims are unverifiable. The brand markets heavily to these groups, but I can’t confirm actual adoption rates.
The felt liner adds thickness. These bags are bulkier than minimal pouch designs from competitors. Trade-off for protection and durability.
MOLLE attachment on MAS series uses hook and loop instead of bungee cord. Bungee would be more convenient for frequent attachment and removal.
Common Questions
Do these actually block Find My iPhone?
Yes. Apple’s Find My works even when phones are powered off or in low power mode. But it requires radio signals to communicate location. With the phone in a properly sealed bag, Find My shows the last known location from before you bagged it. No updates occur while shielded.
How long do the bags last?
The brand offers a two-year warranty. After two months of daily testing with multiple bags, I see no degradation. The felt liner protects the RF shielding material from wear. The 600D exterior holds up to rough handling. These should last years with proper care.
Can I wash them?
No. The RF shielding material doesn’t tolerate water immersion or washing machine agitation. Spot clean the exterior only. The felt liner resists odors naturally, so deep cleaning shouldn’t be necessary.
Will this protect against EMPs?
The MIL-STD-188-125-2 certification covers High Altitude Electromagnetic Pulse shielding. This suggests the bags provide EMP protection, though I can’t test this without an actual EMP. The brand believes their bags offer strong EMP defense based on the testing standards.
What’s the difference between 2-layer and 3-layer?
Both provide complete signal blocking in normal environments. Three-layer bags add extra attenuation for high-interference areas near cell towers, signal boosters, or military equipment. For most people, two layers is plenty.
When These Bags Fail
Even quality bags can fail if you don’t use them correctly. Here’s what actually goes wrong in the field.
Improper Sealing
The roll-top closure requires two full folds and a secure strap connection. One fold isn’t enough. A loose strap creates gaps. I tested partially sealed bags and signals leaked through every time. The visual confirmation only works if you actually do it right.
Damaged Shielding Material
The RF shielding fabric can degrade if the felt liner gets compromised. Sharp objects, repeated folding in the same spot, or aggressive handling can create weak points. Once the shielding layer tears or wears thin, signals get through. The felt liner protects against this, but it’s not indestructible.
Device Positioning
If your phone is pressing against the roll-top closure area, signals can leak at that pressure point. Keep devices in the main body of the bag, away from the closure. Don’t overstuff the bag to the point where it can’t seal properly.
Battery Drain Misconception
Your phone will drain battery faster in a bag because it keeps searching for signals. People see the drain and think the bag isn’t working. The drain proves the bag IS working. Your phone is trying hard to connect and failing. If you need to store a device for extended periods, power it off first.
Wet Conditions
The bags are water-resistant, not waterproof. Heavy rain or submersion can compromise the RF shielding if water gets inside. The outer shell resists normal moisture, but don’t treat these like dry bags. If the shielding material gets soaked, let it dry completely before using again.
When You Actually Need These Bags
Most people don’t need signal blocking bags for daily use. If you’re just trying to avoid notifications or get some quiet time, airplane mode works fine.
You need these bags if you handle sensitive information professionally. Journalists protecting sources. Lawyers securing client data. Security researchers carrying exploit tools.
You need them if you travel through countries where device searches are routine. A phone that’s been powered off in a bag for your entire trip has minimal accessible data.
You need them if you have a keyless entry car and relay attacks are common in your area. Insurance companies are starting to care about this.
You probably don’t need them if your main concern is marketing companies tracking you. Ad tracking is annoying but doesn’t require military-grade signal blocking to defeat.
Final Verdict
After testing eight different brands, GoDark stands out for one specific reason: the roll-top closure design eliminates the guessing game.
With Velcro bags, you never know for sure if you pressed hard enough. With magnetic closures, you wonder if the magnets are still strong. With zippers, you check for gaps. The roll-top gives you visual confirmation every time.
The signal blocking works. MIL-STD certification with lab testing backs up the marketing claims. Construction quality holds up to daily abuse. The felt liner is smart engineering that extends bag lifetime.
Prices are mid-range. Not the cheapest option, not the most expensive. You’re paying for the roll-top design, MIL-STD compliance, and durable construction. Fair value for what you get.
The main downside is slower access compared to Velcro or magnetic bags. If you open and close your bag 20 times per day, the roll-top gets annoying. But if you seal your device for hours at a time and need confidence the seal stays secure, this design wins.
Buy from the official site if you want manufacturer support and warranty handling. Buy from Amazon if you want faster shipping and easier returns.
My Recommendation
Start with the Standard Phone Bag at $60. Test it for a week. If the roll-top closure works for your use case, these bags deliver solid value. If you find yourself annoyed by the folding and securing, try Mission Darkness or OffGrid with their faster closure systems.
The Crossbody Bag is worth the $110 if you travel frequently and want hands-free carry with signal protection. The Vault is essential if you have a keyless entry car and park outside.
The MAS Series and Tablet Bags are specialized products. Only buy them if you specifically need MOLLE attachment or larger device capacity.