It's a lot smaller than a credit card so seems big enough to be secure but doesn't add much room in my bag. At first the lower rounded end looked too deep/broad, but after putting my 4 cards and 5 bills in, the rounded part wasn't much higher than the cards/bills themselves. I wanted a minimal feel in my pocket and that's exactly what I need it - evil light and basically as deep as the cards/bills it has to hold. I'm afraid the cards will get scratched as they slide in and out, but so far (5 days of use) it hasn't, even with the firm grip/pressure it uses to hold the contents.