Update: Light Plasti Dip spray on card sleeves. The problem is solved. Original Review: This is my second big skinny. My first was Men's World Bi-Fold Slim. I still have the Men's World Bi-Fold Slim and will continue to use it after getting frustrated with the Bi-Fold Curve. The ad says it contains 20 cards. It might actually be doable, but you could just as easily fit 8 people in a Honda Fit. Possible, but not practical. The wallet would protrude so much that it would make sense to buy a wallet that spreads the load over a larger area - like the Men's World Bi-Fold Slim. Even with the Men's World Bi-Fold Slim or any other wallet, 20 cards get in the way in my experience and probably defeat the purpose of having a wallet with the design goals of the Big Skinny line: slim and more comfortable to carry. Regardless, I knew what I was buying, so any sizing issues I have are for those who might think they can comfortably carry 20 cards in this wallet. I consider Men's World Bi-Fold Slim my favorite wallet of all time. After almost 3 years of daily use and carried in my back pocket it is still in excellent condition and very comfortable. However, the card slots have loosened up a bit over time. I don't want to exaggerate, but the card slots no longer hold cards as securely as we'd like. Not enough to make the cards easy to drop, but enough to make me decide to replace them. I went back to Big Skinny for a replacement and settled on the Curve Bi-Fold. It's obviously smaller than the Men's World Bi-Fold Slim and is meant to be used in a front pocket. My only complaint, and a big one at that, is the card slot. Even if the cards are in protective sleeves, they sit freely. Too loose in my opinion. Not *enough* enough for them to fall out after opening the wallet and shake test, but close. Without protection cards, cards fall out very easily with a moderate test shake. Not good. It is not very good. Regardless, I like the design so much that I intend to add a non-slip coating to the inside of the card slots or maybe to the card covers I use. Maybe Plasti Dip or some other product. Unfortunately, I am disappointed with the Bi-Fold Curve compared to the long-term performance and design of the Men's World Bi-Fold Slim. The great design is confused by the free card slots. Perhaps the non-slip coating makes this wallet safe and comfortable to use. Bottom line, I can't recommend Curve Bi-Fold if you don't use card sleeves, or even if you do. Curve is potentially a great wallet cursed only by poor card slot design.
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