While many people are making use of their smartphones to "carry" a stash of cards around, the technology sometimes fails and not all stores are willing to accept a digital version.
Instead, we love this idea of re-purposing an old business card organizer. Because let's face it: You haven't used a hard-copy contacts book since your 1998 Nokia.
Here's the idea, from Real Simple:
Keep a (non-spinning) contact file by the front door. But instead of business cards, stock it up with club cards, membership cards and gift cards—sorted alphabetically of course.
Now when you're on your way out the door, you can grab the cards you'll need along with your keys and sunglasses!