A travel wallet is the difference between holding four passports, boarding passes and a currency envelope in your hands at a check-in desk, and having one thing to open.
The family wallets take up to six passports with separate card slots and a zipped section for receipts and foreign notes. The single versions are slimmer and sit in a jacket pocket. All of them block RFID, so card and passport chips can't be read through the fabric.
If you want the same protection in something you wear rather than carry, the anti-theft crossbody bags have an RFID pocket built in.