Here in London, we use refillable plastic cards (known as Oyster cards) to pay for our public transportation fare. Since Oyster cards can be read through your wallet, choosing a card case is key.
All Clean Everything products are handcrafted in Romania out of leather from Italian tanneries. My Stitchless Wallet in White has gotten a loottaa use these past few weeks and I'm obsessed. It's are also available in Red and Green (hello, stocking stuffers) and sold alongside a slew of other products, including billfold wallets and bags.