What's in your wallet

[Goalpost]

meaning cards......I counted 15 cards. I have my driver's license. My bank debit card. Another credit card. Two health insurance cards. A pet vet card. Two gift cards. One casino card. A Speedway card. A UDF card. A Walgreen card. Two furniture company, if I want to charge things with them, cards. And a Kroger card.

So the idea occurred to me. Why cant I have just one card with everything from all the cards stored on it. I realize there are different numbers on these cards, but seems you could make a main card and just branch all your other card numbers off it.