A Faraday bag (also called a pouch or sleeve) blocks wireless signals such as cellular, Wi-Fi, Bluetooth, GPS, RFID and NFC while it is fully sealed. It is useful for phones, laptops, car keys and cards. In Australia the practical options we stock are the Mission Darkness phone sleeve, laptop sleeve and key-fob pouches. Test yours with a call or Bluetooth check after sealing.
Quick answer:
A Faraday bag stops new wireless signals from reaching whatever is inside once it is fully sealed. Use the phone sleeve for everyday devices, the laptop sleeve for larger items, or the key-fob pouch for car keys. Seal it completely and test it.
A Faraday bag, pouch or sleeve is a soft container lined with material that blocks radio-frequency signals when closed properly. The different names simply describe the shape: a sleeve is usually flatter, a pouch is often smaller, and a bag can be larger. They all work on the same idea.
The lining stops radio waves (cellular, Wi-Fi, Bluetooth, GPS and similar signals) from entering or leaving while the bag is fully sealed. Radio-frequency (RF) signals are the wireless connections your devices use. The seal must be complete – roll or fold the closure fully and do not let cables or other items cross it. An incomplete seal lets signals through.
Choose by what you want to protect.
All three block cellular (including 5G), Wi-Fi, Bluetooth, GPS, RFID, NFC and radio signals from low MHz to 40 GHz while fully sealed, according to MOS Equipment.
If the test fails, check the seal first. A bag that is not fully closed will not block signals.
While sealed, a Faraday bag blocks new wireless contact. It does not delete data already stored on the device, remove location history, stop number-plate cameras, or replace good account security. When you open the bag the device can connect again as normal.
A sealed key-fob pouch blocks the signal used for keyless entry and starting. Keep keys away from doors when not in use and consider other steps recommended by motoring groups, such as a steering lock. Test the pouch on your own car.
Use a sleeve for cards, passports or a phone when you want to limit wireless contact. It is a practical option for reducing exposure on the move.
Many people use a Faraday bag as a simple off switch for a privacy phone. While sealed, the phone cannot send or receive wireless signals. See our Secure Phone Australia Guide for more on the phones themselves.
A Faraday bag sets a phone aside during family time or meetings without powering it off completely.
Avoid sharp creases, punctures and extended water contact. Nothing should cross the seal. The faraday material can degrade if damaged. Re-test the bag after rough use or every few months. Follow the manufacturer’s usage notes.
Household foil can reduce signals briefly but tears and is hard to seal reliably. A purpose-made bag with a proper closure is more consistent. Not every bag works equally well – look for published testing standards. Passive Faraday bags are legal for personal use in Australia; they are different from signal jammers, which are restricted. This is general information only, not legal advice.
PrivacyPros is an Australian company with local support. We stock the Mission Darkness range and encourage you to test the products yourself. We are community-focused and happy to answer any practical questions.
A Faraday bag (also called a pouch or sleeve) is a soft container lined with material that blocks wireless signals when it is fully sealed. It stops cellular, Wi-Fi, Bluetooth, GPS, RFID and NFC from reaching whatever is inside.
Yes, when fully sealed. A key-fob pouch blocks the signal that allows keyless entry and starting. Motoring organisations note that pouches stop the signal only while closed; an open flap or incomplete seal lets the signal through. Test it on your own car.
For most people the Mission Darkness key-fob pouch is the practical choice we stock. It is sized for two fobs or one fob plus keyring items, is serialised, and uses three layers of TitanRF material. Always seal it fully and test it on your own vehicle.
Passive Faraday bags that simply block signals are legal for personal use. They are different from signal jammers, which are restricted. Using a bag does not give permission to hide a crime. This is general information only, not legal advice.
Seal the device inside completely. Call the phone or try Bluetooth audio – you should get no connection. For keys, seal the fob and try keyless entry on your own car. Re-test after rough handling or every few months.
Household foil can reduce signals for a short time but tears easily and is hard to seal reliably. A purpose-made bag with a proper closure and published testing standards is more consistent for everyday use.
No. While the bag is sealed the device cannot receive or send wireless signals, so it is not actively connecting. Battery use is the same as if the device were in aeroplane mode or powered off.
PrivacyPros stocks the Mission Darkness phone sleeve, laptop sleeve and key-fob pouches. We are an Australian company with Australian support. See the product pages for current details.
No. A bag is an off switch for wireless signals while sealed. A privacy phone reduces tracking and data collection by the operating system and apps all the time. Many people use both.
A Faraday bag is a practical way to block wireless signals when you need an off switch for a phone, laptop or car keys. Choose the size that fits what you want to protect, seal it fully, and test it. PrivacyPros stocks the Mission Darkness range with Australian support.
-> See Faraday Bags
-> See Privacy Phones
-> See Privacy Laptops
-> See Off-Grid
[Last reviewed: 4 June 2026]
Naomi Brockwell, founder of ludlowinstitute.org and a leading privacy advocate – explains well how Faraday works and issues to consider. We highly recommend her YouTube channel for the continued excellence she and her team provides for our rights to privacy.
