SLNT holds the only patent on Faraday cage systems for consumer products. Their Multishield material blocks 100 dB+ across all frequencies, which is stronger attenuation than most competitors offer.
Black Friday Sale: 25% off site-wide through their official website.
I’ve tested six products over the past year, with the Essentials Backpack in regular daily use. The patented magnetic closure system is what sets them apart. One-handed operation, secure seal, no fumbling with Velcro or worrying about fold overlap.
The construction quality matches premium pricing. Weatherproof nylon that actually keeps devices dry. Top-grain leather options for professional environments. YKK zippers throughout. These aren’t consumer products that happen to block signals. They’re signal-blocking products that also function as premium bags.
When Google and the US Army trust a brand for data protection, that tells you something about verified performance.
My Top SLNT Picks
- Essentials Faraday Backpack
- Weatherproof Nylon Phone Sleeve
- E3 Faraday Backpack
- Waterproof Faraday Backpack
- Leather Phone Sleeve
What Sets This Brand Apart
After extended testing with multiple products, three features consistently distinguish them from other brands.
Patented Magnetic Closure
This is the only brand with a patent on their magnetic closure system. The magnets are positioned to create a continuous seal when closed. No gaps, no overlap calculations, no technique required.
I tested this against Velcro and fold-closure bags. The magnetic system is faster and more reliable. One-handed operation once you learn where the magnets catch. No checking if you sealed it properly. Click closed, it’s sealed.
The patent means competitors can’t copy this design. Exclusive rights to this specific magnetic Faraday closure system.
Multishield Fabric Performance
Multishield blocks 100 dB+ across all frequencies. Most competitors claim 60-80 dB attenuation. This exceeds that by 20-40 dB.
The fabric is MIL-STD-188-125-2 compliant and exceeds IEEE 299-2006 standards from 1 to 40 GHz. That covers everything from low-frequency RFID through 5G mmWave bands.
The published 100,000:1 reduction ratio means for every 100,000 signal units trying to get through, only 1 makes it. That’s stronger blocking than budget bags by orders of magnitude.
Premium Materials and Construction
Materials you won’t find in budget bags. Weatherproof 400D-700D nylon. Top-grain cow leather. Recycled materials with sustainability certifications. YKK and Duraflex hardware throughout.
The construction quality is visible. Clean stitching, reinforced stress points, proper padding on straps. These bags look and feel premium because they are premium.
Essentials Faraday Backpack
The Essentials Backpack brings signal blocking to a daily carry format. Removable Faraday laptop sleeve with magnetic closure. Hidden RFID-blocking pocket. 18 liters of organized storage.
Specs
- External dimensions: 18.5″ x 12″ x 5.8″ (47 x 30.4 x 14.7 cm)
- Volume: 18 liters
- Weight: 2.88 lbs (1.30 kg)
- Exterior: Recycled 700D water-resistant material
- Hardware: Duraflex and YKK zippers
- Fits laptops up to 16 inches
- Removable Faraday sleeve with FIDLOCK magnets
- Hidden RFID-blocking passport/card pocket
What I Tested
I’ve used this backpack for daily commuting for over a year. Laptop goes in the Faraday sleeve when I’m on public transit or in coffee shops. Pull it out when I need to work.
The removable sleeve is smart design. When you don’t need shielding, remove the sleeve and use the backpack normally. When you do need protection, snap it back in with the FIDLOCK magnets.
Signal blocking matched published specs. Put my MacBook Pro 16″ in the Faraday sleeve, sealed the magnetic closure. No iMessages, no Find My location updates, no Bluetooth connections. Complete blackout.
Organization and Comfort
Front compartment has multiple pockets for organizing smaller items. Main compartment with 18-liter capacity fits a day’s worth of gear. Water bottle pockets on sides. Luggage pass-through on back panel. Sternum strap for load distribution.
The recycled 700D material is durable without feeling heavy. YKK zippers are smooth. The shoulder straps have proper padding that doesn’t compress after months of use.
Where It Excels
This is the best option for daily commuters who need occasional signal blocking. Not constant shielding, just the ability to go dark when the situation requires it.
The professional appearance works in office environments. Doesn’t look tactical or paranoid. Just a nice backpack that happens to have Faraday protection built in.
Limitations
The 18-liter capacity is smaller than the OffGrid Backpack Pro (22.5L) or Mission Darkness Dry Shield 40L. Fine for daily carry, limited for travel or multi-day trips.
The Faraday sleeve only shields the laptop compartment. If you need to shield multiple devices simultaneously, you’ll need to buy separate sleeves or choose a different bag.
Check price on Amazon | Visit official site
Weatherproof Faraday Phone Sleeve
The phone sleeve is where most people start. Magnetic closure, external non-shielded pocket, weatherproof construction.
Specs
- Internal dimensions: 6.65″ x 4.52″ (fits iPhone 15 Pro Max, Samsung Galaxy S24 Ultra)
- External dimensions: 8.4″ x 4.75″ x 0.4″
- Weight: 0.21 lbs
- Materials: Weatherproof ballistic nylon or top-grain cow leather
- External non-shielded pocket for quick access items
- Patented magnetic closure
- MIL-STD-188-125-2 compliant shielding
Real World Testing
I tested this sleeve with my iPhone 15 Pro for three months. Signal blocking results matched earlier testing:
- Cellular: Zero bars, “No Service,” no reconnection attempts
- WiFi: MAC address invisible to router, device dropped completely
- Bluetooth: AirPods disconnected instantly, phone disappeared from paired devices
- GPS: Maps froze at last known position, no satellite lock
- NFC: Apple Pay disabled, couldn’t trigger contactless payment
The weatherproof claim is accurate. Left this in my truck during a rainstorm. Phone stayed completely dry. The ballistic nylon sheds water better than Mission Darkness’s water-resistant fabric.
The magnetic closure is the smoothest I’ve tested. Click it shut, it’s sealed. No checking if you folded it right or pressed the Velcro down properly.
The External Pocket
The non-shielded external pocket is smart design for people who want quick access to cards or cash without opening the main compartment. Keeps frequently used items accessible.
Warning: Anything in this external pocket is NOT shielded. Don’t put your credit cards there thinking they’re protected. Only the main compartment blocks signals.
Professional Appearance
The weatherproof nylon version works for travel and outdoor use. The top-grain leather version is for office and professional environments where appearance matters.
Neither version looks tactical or paranoid. They could pass for regular phone cases if someone glances at them.
Who This Works For
People who work in coffee shops or coworking spaces and want to secure their phone during breaks. Travelers who need signal blocking for border crossings. Anyone who wants premium materials with verified shielding.
Check price on Amazon | Visit official site
E3 Backpack
The flagship product. Fifteen purpose-built compartments. Removable Faraday laptop sleeve and phone sleeve included. Sustainable materials. This is the statement piece.
Specs
- Exterior: Recycled water-resistant material
- Removable Faraday laptop sleeve (fits up to 15″ laptop)
- Medium Faraday phone sleeve included
- Fifteen organized compartments
- FIDLOCK magnetic attachments
- Patented Silent Pocket magnetic closure
- YKK zippers throughout
- Hidden RFID-blocking pocket
Premium Organization
The E3 has more organization than any other Faraday backpack I’ve tested. Front daisy chain for accessories. Multiple zippered pockets of different sizes. Stretchy mesh pockets. Hidden secure pocket on back panel for passport or cash.
The laptop sleeve attaches with FIDLOCK magnets. Remove it when you don’t need shielding. Snap it back when you do. Same system as the Essentials but with additional phone sleeve included.
Testing Results
I tested the E3 for two months. Signal blocking matched other products tested (100 dB+ attenuation). The included phone sleeve blocked signals identically to the standalone phone sleeve.
One issue: the zipper on the laptop compartment sometimes snags on the corner of the Faraday sleeve. Not a dealbreaker, but it interrupts the smooth unzipping experience.
Build Quality
Boxy structured design that looks professional without being boring. Thick padded handles at top and side. Comfortable shoulder straps that distribute weight properly.
The recycled materials add sustainability without compromising durability. After two months of regular use, no wear or damage visible.
The Premium Tax
The E3 costs significantly more than the Essentials Backpack. You’re paying for the additional organization, included phone sleeve, premium sustainable materials, and flagship design.
Worth it if you want maximum organization and don’t mind spending for it. Overkill if you just need basic signal blocking with daily carry capacity.
Waterproof Backpack
Roll-down closure with full interior shielding. The entire backpack is a Faraday cage when sealed properly. 20 liters of capacity. Submersible for 30 minutes at 10 feet.
Specs
- Dimensions: 15″ x 15″ x 3″ when closed
- Capacity: 20 liters
- Materials: 400D Rip Stop Nylon TPU with RF welded seams
- Interior: Multishield Faraday shielding material throughout
- Roll-down and clip seal closure
- Dual opening pocket with seal
- Adjustable shoulder straps
- MOLLE loop for accessories
- Exterior zippered pocket (non-shielded)
Complete Interior Shielding
Unlike the Essentials or E3 where only specific pockets are shielded, this bag shields everything inside when sealed. No thinking about which compartment to use. Everything is protected.
The RF welded seams eliminate stitch holes. Similar concept to OffGrid’s thermo-welded construction. No weak points where signals can leak through traditional stitching.
Waterproof Performance
I tested waterproofing by submerging the bag for 30 minutes. Everything stayed dry. The roll-down closure with clip seal creates a proper waterproof barrier when rolled correctly.
You need at least three tight rolls before clipping. Two rolls isn’t enough. One roll definitely won’t seal it. Practice the technique a few times.
Signal Blocking
Results matched other products tested. Complete blackout across all frequencies when properly sealed.
The key is “properly sealed.” The roll-down design requires correct technique. If you don’t roll it tight enough or miss a corner, signals will leak.
Best Use Cases
Water activities where devices need protection from both water and signals. Kayaking, boating, beach trips. Outdoor work in wet conditions.
Travel where you want everything shielded without thinking about compartments. Border crossings. Protests or sensitive meetings where all devices need protection.
The Drawbacks
Access is slower than zipper bags. Unroll, remove device, roll and seal again. Not ideal for frequent access throughout the day.
The roll-down takes up interior space. When properly sealed with three rolls, you lose several inches of height to the rolled portion.
Check price on Amazon | Visit official site
Leather Phone Sleeve
Same construction as the weatherproof nylon sleeve, but in top-grain cow leather. For professional environments where appearance matters as much as function.
Materials and Design
Top-grain cow leather exterior. Multishield Faraday lining. Patented magnetic closure. External non-shielded pocket.
The leather adds weight compared to the nylon version. Feels more substantial in hand. Develops patina over time if you’re into that aesthetic.
Performance
Signal blocking is identical to the nylon version. The Multishield material is the same regardless of exterior material choice.
The leather is more professional looking but less weather resistant than nylon. Fine for office environments, less ideal for outdoor use or variable weather.
When to Choose Leather
Corporate environments where tactical-looking bags stand out. Client meetings. Professional contexts where you can’t show up with outdoor gear.
The leather version says “professional who values privacy” rather than “paranoid about surveillance.” Perception matters in some environments.
Utility Bags
Basic pouches for evidence collection, device storage, or field work. Available in multiple sizes from phone to large device capacity.
What They Are
Simple Faraday pouches with roll-down Velcro closure. Clear external window for labeling or identification. 400D-600D nylon construction. Multishield interior.
These bags were designed for law enforcement and forensic investigators. Now available to everyone.
Sizes and Capacity
Small: Phones and small devices Medium: Tablets Large: Laptops XL: Multiple devices or solar panels (42″ x 30″ x 8″)
The XL size is massive. Designed for long-term storage or transportation of multiple devices. Fits solar panels, which tells you about the capacity.
When You Need These
Evidence preservation. Device storage during transport. Long-term storage in unsecured locations.
These are utilitarian bags. No premium materials or organization features. Just signal blocking in a functional package.
The clear window is useful for labeling what’s inside without opening the bag. Forensic teams use this for chain of custody documentation.
The Strengths
After extended testing across multiple products, here’s what consistently impressed me.
Patented Technology
The magnetic closure system is genuinely better than Velcro or fold closures. Faster, more reliable, easier to use. The patent means no competitor can copy it.
This isn’t marketing hype. The magnetic system provides practical advantages in daily use. One-handed operation matters when you’re juggling other items.
Premium Materials
Higher-quality materials than most competitors. Weatherproof nylon that actually works. Real top-grain leather. YKK and Duraflex hardware. Recycled materials with sustainability certifications.
You’re not just paying for signal blocking. You’re paying for construction quality that lasts.
Verified Enterprise Trust
When the brand says Google and the US Army use their products, they’re not making it up. Government and enterprise contracts require verified performance.
This brand has passed testing that budget bags never face. The trust from serious organizations adds credibility.
Design Choices
Bags that look normal. Professional appearance. Clean branding. You can use these in corporate environments without looking paranoid.
The non-tactical aesthetic matters for people who need signal blocking but work in professional contexts.
The Limitations
No brand is perfect. Here are the real limitations I found during testing.
Premium Pricing
These bags cost more than Mission Darkness or OffGrid for equivalent products. You’re paying for the patent, premium materials, and brand positioning.
The Essentials Backpack costs more than Mission Darkness Dry Shield 40L, which has double the capacity. The phone sleeve costs more than OffGrid Mobile despite similar signal blocking.
Worth it if you value the magnetic closure and premium materials. Expensive if you just need signal blocking and don’t care about appearance.
Smaller Capacities
The Essentials Backpack is 18 liters. The E3 has no listed capacity but appears similar. The Waterproof Backpack is 20 liters.
Compare to OffGrid Backpack Pro (22.5L) or Mission Darkness Dry Shield 40L. These bags are smaller for the same or higher price.
Limited Availability
Some products sell out frequently on the website. Amazon has better stock but fewer options. If you find what you want in stock, buy it.
Common Failure Points (And How to Avoid Them)
After a year of testing, I found three ways these bags fail despite their quality.
Incomplete Magnetic Seal
The magnetic closure needs proper alignment to work. If you close it at an angle or miss the magnetic catch point, the seal won’t be complete.
How to verify: After closing, try to pull the bag open gently. If it pops open easily, the magnets didn’t engage properly. Reclose and feel for the magnetic click.
Testing: Call your phone while sealed. If it rings, check the magnetic alignment.
Roll-Down Technique Issues
The Waterproof Backpack requires proper roll-down technique. Three tight rolls minimum. Each roll needs to overlap the previous one completely.
I tested this deliberately. Two rolls reduced signal strength but didn’t eliminate it. Three proper rolls achieved complete blackout.
Detached Faraday Sleeves
The removable Faraday sleeves in the Essentials and E3 attach with FIDLOCK or regular magnets. These can detach accidentally if you bump the bag or reach in quickly.
The phone sleeve in the E3 is particularly prone to this. The magnets aren’t as strong as the laptop sleeve attachment.
Prevention: Check that sleeves are fully attached before assuming devices are shielded. Press firmly on all magnetic connection points.
The good news: these are all user errors, not design flaws. Use the bags correctly and they work perfectly.
Comparing the Competition
Understanding how these bags stack up against competitors helps you make the right choice for your needs.
Mission Darkness vs SLNT
Both brands target professionals who need verified signal blocking. Different approaches to similar problems.
Mission Darkness strengths:
- Lab certifications (MIL-STD-188-125, IEEE 299-2006)
- Wider product selection
- Lower prices for comparable products
- Larger capacity options (Dry Shield 40L)
- 2-packs provide better value
SLNT strengths:
- Patented magnetic closure (faster, easier)
- Premium materials (weatherproof nylon, leather)
- Stronger attenuation (100 dB+ vs 60-80 dB)
- Better professional appearance
- Removable Faraday sleeves for flexibility
Choose Mission Darkness if you want maximum capacity, verified testing, and better value per bag.
Choose SLNT if you want premium materials, magnetic closure convenience, and professional appearance.
OffGrid vs SLNT
Both brands target the same market. Different construction approaches.
OffGrid strengths:
- Thermo-welded seams (no stitch holes)
- Pioneer brand heritage (15 years)
- Four separate compartments in Backpack Pro
- Lower prices than SLNT
- Diamond ripstop interior durability
SLNT strengths:
- Patented magnetic closure vs Velcro
- Stronger published attenuation (100 dB+ vs 69 dB)
- Premium appearance options (leather)
- Removable Faraday sleeves
- Weatherproof submersible options
Choose OffGrid if you want thermo-welded construction, multiple compartments, and better value.
Choose SLNT if you want magnetic closure convenience and premium materials.
Faraday Defense vs SLNT
Both offer strong shielding with professional construction.
Faraday Defense strengths:
- Triple-layer shielding (CYBER NC material)
- Lower prices than SLNT
- Magnetic closure (similar but not patented)
- Strong attenuation (85-90 dB)
SLNT strengths:
- Patented magnetic closure system
- Higher published attenuation (100 dB+)
- More product variety (backpacks, leather options)
- Enterprise and government trust
- Premium sustainable materials
Choose Faraday Defense if you want triple-layer shielding at lower prices.
Choose SLNT if you want the highest published attenuation and patented technology.
Choosing the Right Product
After testing six products, here’s how to decide based on your needs.
Get the Essentials Backpack if:
- You need daily carry with occasional signal blocking
- You want removable Faraday sleeve flexibility
- You work in professional environments
- 18 liters is enough capacity for your needs
- You value recycled sustainable materials
Get the Weatherproof Phone Sleeve if:
- You’re new to Faraday bags and want to start small
- You need weather-resistant phone protection
- You want magnetic closure convenience
- You need quick access via external pocket
- You travel frequently and need border crossing protection
Get the E3 Backpack if:
- You want maximum organization (15 compartments)
- You need included phone sleeve plus laptop sleeve
- Budget isn’t your main concern
- You value sustainable materials and flagship design
- You want the best overall package
Get the Waterproof Backpack if:
- You need waterproof plus signal blocking
- You work near water or in wet conditions
- You want entire bag shielded (not just pockets)
- You’re comfortable with roll-down technique
- You need submersible protection (30 min at 10 ft)
Get the Leather Phone Sleeve if:
- You work in corporate environments
- Professional appearance matters as much as function
- You want premium materials that develop patina
- You don’t need outdoor/weather durability
- You value the aesthetic of leather over nylon
Testing Methodology
I tested each product with the same devices and procedures used for other brand reviews:
Devices tested:
- iPhone 15 Pro (primary test device)
- Samsung Galaxy S23 (secondary test)
- MacBook Pro 16-inch
- Honda Accord key fob
- American Express contactless credit card
Tests performed:
- Phone call test (did phone ring when sealed?)
- Wi-Fi visibility (could networks detect MAC address?)
- Bluetooth pairing (could devices connect?)
- GPS lock (could phone get satellite position?)
- RFID reading (could reader detect contactless cards?)
- iMessage delivery (did messages arrive with device sealed?)
- Find My tracking (could Apple locate device?)
Additional testing for waterproof products:
- Submersion testing (30 minutes, checked for moisture)
- Rain exposure (left in truck during storm)
Each bag was tested multiple times to verify consistency.
Common Questions
Is SLNT worth the premium price?
Depends on what you value. If you want the strongest published attenuation (100 dB+), patented magnetic closure, and premium materials, yes. If you just need signal blocking and don’t care about convenience or appearance, there are cheaper options that work.
Does the magnetic closure work as well as they claim?
Yes. It’s faster and more reliable than Velcro or fold closures. One-handed operation once you learn the technique. The patent means this specific design is exclusive.
Can I use the Faraday sleeves in other bags?
The removable sleeves from the Essentials and E3 can be used independently. They’re standalone Faraday pouches that happen to attach to bags with magnets. Useful flexibility.
How does 100 dB attenuation compare to other brands?
Most brands claim 60-80 dB. This exceeds that by 20-40 dB. In practical terms, this means stronger signal blocking. Your phone is more completely offline.
Whether you need that extra attenuation depends on your threat model. For most people, 60-80 dB is plenty. For maximum security, 100 dB+ is better.
Are these bags TSA approved?
Yes. They scan like any other textile going through X-ray machines. Won’t be flagged. Multiple users report no issues with airport security.
Can I charge my phone in a Faraday bag?
Not with a wall charger. Running a cable through the bag breaks the seal and signals leak through. You can use a portable battery inside the bag as long as everything fits and the bag seals properly.
Will Find My work with my device in the bag?
No. That’s the point. Find My requires signal connection. A properly sealed Faraday bag blocks the signals Find My needs. Your device will show last known location from before you bagged it.
This is a feature, not a bug. If Find My worked through the bag, so would tracking and hacking attempts.
Final Verdict: Premium Protection With Patented Convenience
SLNT delivers on its premium positioning. The Multishield fabric blocks 100 dB+ across all frequencies, verified by MIL-STD and IEEE standards. The patented magnetic closure is genuinely better than alternatives. The materials and construction quality justify premium pricing.
The Essentials Backpack is the best option for most people. Daily carry capacity, removable Faraday sleeve, professional appearance, reasonable price for what you’re getting. It solves the daily commuter use case better than any competitor.
The phone sleeves (nylon or leather) are where you start if you’re new to Faraday bags. Magnetic closure convenience, weatherproof or professional materials, external pocket for quick access. Easy to use, proven to work.
The E3 is for people who want maximum organization and flagship design. The Waterproof Backpack is for specific use cases where water and signal protection both matter.
These bags aren’t the cheapest option. Mission Darkness provides better value. OffGrid offers pioneer brand heritage with thermo-welded construction. But if you want the strongest published attenuation with the most convenient closure system in premium materials, SLNT delivers.
The patent matters. No competitor can copy the magnetic closure design. You’re buying exclusive technology that makes signal blocking more convenient in daily use.
Worth it if convenience and premium materials matter to you. Expensive if you just need basic signal blocking and don’t care about the details.