@avizuber thanks for the question. We have used about 5-10 comfortably but the elastic can accommodate 25 cards. You can also stash a few bills on the outside as well.
I've been wanting to make the transition from a full size wallet to this "minimal card style" wallet for a while now. My only issue was always not being sure about how much cash it can hold without looking too bulky/out of place. The design does look great though. Look forward to hopefully trying it!
Just For Today by Fred (Not Freud)