I would like to know as well.
How strange - I was fixing to ask this exact question myself! Having just today received my Apple FCU Visa, I now have seven credit cards and three debit cards to store, plus my driver's license, health insurance ID cards, various discount program cards and other miscellaneous cards...and needless to say, cash.
I have an 8 (9) card slim wallet to carry with me, and a 24ish card bifold to store unused cards, etc
This has been my solution ^. Rotation to a high-end wallet (I use a hipster wallet) is the only way to avoid damage by over stuffing whatever you are carrying.
I have tried the Sharkk brand(metal RFRID reflector) but they bust open if I try to squeeze more than 8 cards including my license. They have larger ones that cary more cards and cash but cost a little more in the 20-30 range on Amazon.