Made this handy little storage unit to hold some of my Project Life style cards. It holds 2 rows of 3x4 and one in the back of 4x6. I used a Silhouette file.The 3d vertical journaling card storage box by Lori Whitlock #48178. I have to admit, I was a bit skeptical. The cards are heavy and generally, using a standard card stock was going to leave it a bit flimsy. I opted to use 110 lb stock, Michaels brand. Once this bad boy is constructed, it is hearty! I was very impressed. So much so, I have made two more. If you are unsire of how the box goes together, Lori Whitlock has made some fantastic video tutorials on You Tube. Try one out and let me know what you think.