TravelamboFront Pocket Minimalist Leather Slim Wallet RFID Blocking Carbon Fiber Texture

Has the rfid protection in this wallet been tested by anyone that isn't the company/seller?

Questioning the clear/open center section of the wallet, as to the effectiveness of the rfid protection. what are people putting in this section?

What is the real maximum amount of cards it can hold without it being bulky?

I bought a wallet from Amazon before(not this one) and it was so hard and stiff that it almost bent all my cards. Is this the same way or soft?