It holds up to 10-12 cards; I have 5. I use the cash strap on back but with Apple pay on my phone, I do not need much cash. It will hold a substantial amount-I have a couple hundred now and it fits nicely on back. Hint to eliminated extra cards- use an app like key ring to "carry" extra cards (Costco, membership, grocery store, & other cards).
Bottom line-I had a lot in my fat wallet that I did not need! Bet everyone does! It really makes you think and examine your habits to see if there is a better way! Absolutely love my Ridge wallet