Measured. Verified. Serializable.
Every JitsPack Certified Faraday product is tested in a controlled RF harness and validated against physics-based expectations—so the results reflect the enclosure’s performance, not environmental noise.
How JitsPack Measures Shielding Attenuation
This is not a “turn the router on and see what happens” smoke test. For each unit, we measure Wi-Fi, Bluetooth, and cellular received signal strength (RSSI, in dBm) with the device outside the enclosure, then repeat the measurement with the device fully sealed inside the enclosure.
Shielding attenuation is computed as the difference between those two readings, expressed in decibels (dB):
Our T&E software cross-checks those measurements against the standard free-space path loss (FSPL) model for the same distance and frequency:
This helps confirm the RSSI behavior we observe matches what physics predicts—so we know we’re measuring the bag, not a weak tower, a noisy room, or a drifting RF source.
When “No Signal is Detectable” Inside the Bag
In many tests—especially on higher-performing enclosures—the signal inside the sealed bag falls below the receiver’s detectability threshold for the specific device/radio under test. The device cannot reliably report an RSSI value because the remaining signal is beneath what its hardware can resolve.
To handle this consistently:
- We deliberately target the strongest practical outside-the-bag signal (within safe, controlled limits) to maximize measurement headroom.
- We reference hardware-specific detectability thresholds (device/radio dependent) to establish an upper bound on RSSIinside.
- We compute a minimum calculable attenuation using “≤ threshold” rather than a fabricated reading.
What Gets Logged and Serialized
- Signal isolation for Wi-Fi, Bluetooth, and cellular is measured and logged in the JitsPack T&E stack.
- Mechanical abuse, zipper cycles, load, and flex tests are recorded alongside RF performance.
- Each certified unit’s serial number is tied to its configuration and FSR in a downloadable PDF test report.
Suggested report note:
“Inside-the-enclosure RSSI was below the device’s detectability threshold; therefore, the listed attenuation and FSR represent a minimum calculable value. Actual shielding performance may exceed the reported rating.”
Verify your JitsPack Faraday bag
Every bag is serialized and certified after rigorous testing. Enter your serial number to download its official PDF certification.
The Vanguard
Flagship modular EDC platform with integrated Faraday protection and self-locking zippers.
How We Measure Shielding
All testing is done in decibels (dB), using the same math RF engineers use to design radios and antennas.
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Step One: Baseline vs. sealed measurements
RSSI, or Received Signal Strength Indicator, is a measurement of the power of a wireless signal received by a device. For each frequency band we record/measure:
- Baseline RSSI – signal strength with the device outside the faraday enclosure
- Shielded RSSI – signal strength with the device inside the faraday enclosure
Both are measured in dBm (decibels relative to 1 milliwatt).
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Step Two: Shielding effectiveness
Shielding effectiveness is just the drop in signal:
But what is a decibel(Db)?
- 10 dB ≈ 10× power reduction
- 20 dB ≈ 100×
- 30 dB ≈ 1,000×
- 40 dB ≈ 10,000×
We also log packet loss for Wi-Fi/Bluetooth and connectivity state for cellular (connected / marginal / no service) in addition of to other other testing factors (hardware ratings, models, and even weather!)
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Step Three: Serial, QR & Stamp
Once certified, each and every Faraday bag gets a unique serial number along with it’s very own certification report.
Only those that meet the target FSR (Farday Shielding Rating) get to market. So rest assured the thing you’re wearing can be traced back to the very same RF curves and abuse tests we used when we decided it was good enough to ship.
Faraday Shielding Rating
Look—antenna theory and all the weird things photons do at different energy levels is not something you should ever have to worry about. Our nuclear engineers already did that for you.
So instead of throwing equations at you, we built our own rating scheme that feels familiar: Body-Armor-Style Protection Levels… but for your signals.
Photons do some wild stuff, especially around high-powered emitters like cell towers and Stingray devices. We’re straight with you about that. At the quantum level, a photon’s very position is a probability field. That means even with the best shielding in the world, there’s always a tiny chance something sneaks through.
That’s why the only gear you should trust is gear that’s been individually tested, not just “designed to spec.” We test our stuff one unit at a time—so you don’t have to think about quantum anything when you’re out in the real world.
| FSR Level | Shielding Effectiveness (dB) | Practical Effect (Wi-Fi & Cellular) |
|---|---|---|
| FSR I | < 20 dB | Entry-level attenuation. Provides a measurable reduction in RF energy—often enough to shorten range, reduce throughput, and disrupt casual proximity interactions. Best viewed as “signal management” rather than complete isolation. |
| FSR II | 20–35 dB | Solid everyday shielding. Wi-Fi and cellular performance are typically diminished quickly as distance increases, and connections become less stable in indoor or congested environments. A strong choice for routine privacy and reduced device discoverability. |
| FSR III | 35–60 dB | Premium, high-confidence shielding. In real-world use, Wi-Fi is commonly suppressed to the point of non-use, and cellular frequently transitions to intermittent or no service—especially indoors or away from strong coverage. This is the level most customers experience as “my device disappears.” |
| FSR IV | 60–80 dB | Operational-grade isolation for typical environments. Wi-Fi is generally blocked in normal handling, and cellular is usually nonfunctional in common urban/suburban conditions. Results are dominated by closure integrity (zippers, seams, and full seal). |
| FSR V | 80–100 dB | Exceptional isolation. Wi-Fi remains blocked even at close proximity in most setups, and cellular is typically blocked from macrocells and many nearby emitters. Only unusually strong, very close sources—or meaningful leak paths—are likely to penetrate. |
| FSR VI | 100–120 dB | Maximum-performance portable shielding. Approaches lab-style behavior when fully sealed: nearby Wi-Fi and cellular effectively “cease to exist” from the device’s perspective. Achieving this consistently across bands in flexible products requires precise closure design and disciplined use. |
| FSR VII | > 120 dB | Peak containment. This is enclosure-class isolation—typically associated with rigid, tightly controlled shielding systems rather than everyday bags. At this level, you’re not merely reducing signal; you’re performing true RF containment when properly sealed. |
Note: “dB” is shielding effectiveness (attenuation through the enclosure). Real-world results vary with frequency (e.g., 700 MHz vs 2.4/5/6 GHz), distance/orientation, and—most importantly—leak paths (zippers, seams, gaps, partial closure, cables). Ratings should be interpreted alongside the tested band(s) and test setup.