I will openly admit I bought this to store my Project Life cards. Project Life is a photo album/scrapbooking system with pocketed photo sleeves and the majority of the supplies are 3x4 cards and 4x6 cards to fit in those sleeves alongside the photos. It's really hard to store the cards flat, so I thought I would give a box designed for recipe cards a try. It's perfect! The 3x4 cards fit two across, and the 4x6 cards fit just as recipe cards would. You can flip through the cards easily, and organize certain sets and themes. You can also store photos in these boxes.