Worth a read for all of you out there actively fucking these corporations over.
"Most systems can be circumvented by placing the tagged goods in a bag lined with aluminum foil. The booster bag will act as a Faraday cage, shielding the tags from the antennas. Although some vendors claim that their acousto-magnetic systems cannot be defeated by bags shielded with aluminum foil, a sufficient amount of shielding (in the order of 30 layers of standard 20 µm foil) will defeat all standard systems"
If anyone tries any of the jamming methods out, let us know how it went.