4. Hotel room keys
Hotels have jumped on the modern key bandwagon even faster than car manufacturers. It is now rare to get a metal key attached to giant plastic tag for a hotel room, as once was the standard.
Key cards are cheap, easy to use, fit comfortably in a pocket or wallet, and can be recoded and reused. Plus, no one has to rekey a room door if a visitor loses their card on the beach.
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