One way to slim your wallet is to ditch a bunch of cards. Another is to replace them with a Fuze Card. While it’s not the first device to consolidate your cards, it’s definitely the most promising, feature-wise, with capacity for 30 cards (of the credit, debit, loyalty, membership, or gift variety), NFC support for contactless payment, an e-paper display, and a 30 day battery life.
Since it links to your smartphone you’ll get notifications if you leave it behind or if you’ve been pickpockets, and it automatically locks if it’s out of Bluetooth range. Buttons on the card let you select the card you want to use and it’ll also work anywhere the real card would’ve, including at an ATM.