Holds lots of cards perfect for networking events. Unfortunately the "back" isn't wide enough to hold a full bag. For example, the photo shows a fairly full bag, but if you look closely, the loop/back isn't wide enough to close it. So it holds more than the average slim card holder, but not as much as I would like for larger events. Also, a rubber band won't work because the valve is stiff and won't lie flat when the bag is full. The material is decent, nothing special, but it's fine for my main storage purposes.