I really do not know. I said before that I had put somewhere around 15 and it was not full. When you transfer pictures it changes them so they use less storage space. You click on add an image and then go to where you have a picture stored and then the device processes the image and it is now on the device. You repeat this until the device is full. I am going to see how many photos I can put on it and then I will comment again.
So I am still converting photos and I am past 15 so it holds a good amount and it is only the thickness of a couple of credit cards so it is a great way to keep all your favorite people with you all the time!!