There are multiple steps that went into these packaging mockups.
1. Research the size of Cereal Boxes and Pastry boxes.
2. Find matching die lines.
3. Design per the correct dielines all sides of the boxes.
4. Have 3D images generated to showcase final product.
Additionally, (3rd image below) I was able to print actual samples of these boxes to have real life examples to confirm everything looks the way it needs to per final guidelines.
3D generated image of Cereal Box
3D image generated of a toaster pastry box.
Photographs of printed and assembled mockups of the cereal box.