Idea: using antique cigarette cases as Faraday-cage credit card wallets

Old, metal cigarette cases from the 1920s and 30s are often attractive, inexpensive, and exactly the right size for modern-day credit and ID cards. Like the metal mesh in microwave ovens (which stops the harmful microwaves from leaving the oven), or as when putting a cellphone inside a metal coffee can (which prevents the phone from wireless communications), metal boxes act as Faraday cages, preventing electromagnetic radiation from either entering or exiting, possibly thwarting credit card skimmers/scanners. Using a metal box as one’s wallet also has the benefit of protecting the contents much better than leather or canvas.

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