All leather passport wallets will easily fit 4 cards and a bit of cash, even more if you allow the leather to stretch. Please note that if you plan to fit the entire passport into the pocket (instead of just the back cover of the passport), you may need to allow a week for the leather to stretch into shape and soften up. This is normal, and it will mold perfectly to your liking.
The Leather Passport Wallet measures 5.25 inches tall x 4 inches wide (133mm x 102mm) when folded and is about 3/16 inch (4.7mm) at its thickest point. Designed to fit only one standard sized passport up to 5 inches x 3.5 inches. If you need to fit two passports, check out this Double Passport Wallet.