Booster bag

[Q_]

In a completly hypothetical situation, let's say I need to make a booster bag, the kind that's used to defeat RFID tags, anyone know a surefire way to make one? I was thinking of(hypotheticaly) taking a laptop bag and making a pocket on the inside make of about 15 layers of tin/aluminium foil and duct tape. Would this work? Or could it fail, baddly. I have a way to test it out as well if anyone else has any ideas

[ravenmaddox]

I have been curious about the same in a purely hypothetical sense. I have heard that mylar, like the mylar baloons wal-mart sells, are a good shield but everything I read says that the mylar needs to be closed like overlapped because if there is any kind of seam, the seam could act like an antenna to broadcast the signal. Perhaps could experiment with covering the base to a cordless phone until something blocks the signal.

The other thing I have read is that carbon absorbs the signals, so theoretically a bag of charcoal or a crushed charcoal liner with a few millimeter thickness all about should do the trick and not be as noisy as tinfoil.