The CACHE (Gen-3) wallet is our thinnest RFID-blocking* wallet that can carry up to 20 standard-sized credit cards, and a stack of bills. The CACHE (Gen-3) comes with a "Spare Key" holder for you to store a spare key in the bill compartment. It features a special RFID-blocking material that shields your personal data from high-tech pickpockets using scanners to collect your personal information found in credit cards, security cards, and passports containing RFID chips**. Double-stitched all around, combined with 1000-D military grade Cordura fabric (500-D for MultiCam-Black) coated with DWR (Durable Water Repellent) fabric protector, this durable wallet will safeguard your identity. *Protects cards sandwiched between the RFID-blocking fabric, effective for High-Frequency 13.56 KHz RFID system. **RFID chips can be found in new US passports, credit cards with "contactless payment" symbol, and most security key cards.