What "system"(?) can I use for ALL THIS PLASTIC when my wallet cannot hold them all?

Years ago my wife and I decided to go on a cash basis. Really, a 30 day basis. We have cards from a few department stores but we don't carry them unless there's a special discount for using that card and the store has something we want. Otherwise, we use one credit card for everything and pay off the charges each month. No interest charges. Once we got used to it we found we were saving more and the cash back from the one card we use has returned thousands to us over time. As far as membership cards, I have one plus the discount cards from the grocery stores I shop. But the stores can also look up your membership using your phone number, and so can department stores if you give them a little more information. I switched from a huge wallet to a "front pocket wallet" with just the cards I use and the small amount of cash I carry. What a relief! And I don't feel like I'm sitting on a huge rock.