You can run as honking big a magnet as you want over the mag strip, with no harm. But, COLLAPSE even a smallish magnetic field a few times, and it's another story. Tis a collapsing magnetic field (or, worse, one rapidly changing polarity) that does it not a static fieldOriginally Posted by R1Aaron



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If you are still worried just put you cards in the side pockets or map-holder pocket so they are not directly next to the magnets. 

Interesting point - magnets have a (duh) magnetic field surrounding them when in free space.



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