How many of us walk around with a keychain full of loyalty cards, far outweighing the amount of keys that are actually meant for the KEYchain? I only have one key (to my car), on my keychain. My house has a keypad lock, which eliminates the need to carry a key – and I leave the mailbox key in the car. So, why does my keychain weigh 5 pounds? The loyalty cards! Yes, cards, as in a whole lot of cards; three for the grocery stores in my town, one for the pharmacy, the local coffee shop,....