Step 1: Carefully break apart the flaps that are glued together to flatten your box.
Step 2: Grab a ruler from the front of the room and measure the size of each panel and flap.
Step 3: Go to Illustrator and watch this short video clip below on how to easily make rectangles that are a specific size. In the end, you should have something similar to what is pictured below. Yours will obviously be different, depending on the dimensions of your individual box.
