I purchased these boxes for fruit pies I bake for wedding clients. As I usually have 10-18 pies to deliver at once for these events, I needed a pie box that was sturdy enough to stack. In addition, the boxes needed to be strong as I use 9" GLASS dishes for my wedding pies and they add a substantial amount of weight. These boxes were perfect for the job! I placed a 12" cardboard cake circle in the bottom, added a rolled piece of painters tape to secure the dish in transit, placed the pie in, and stacked them 3 high. Delivered over an hour away with no issues - and looking sharp in these windowed boxes! Thank you!