Attach the navy blue corrugated plastic with the stars on the upper left corner of the flag with the mounting tape. Using your sharp scissors, cut up a small way on the inside of the white corrugated plastic to make it easier to insert the Popsicle stick. Add tacky glue to the end of the stick and push up inside the tomato. If using tacky glue, allow to dry overnight. Tips You can also use regular cardboard and paint it if you can't get corrugated plastic, but it won't be as durable.
Corrugated plastic is made by several manufacturers.
It is known as Stratocore or Coreplast, along with other names. I found that if I purchased it from a signage store it was cheaper as long as I was going to make several projects out of it. Otherwise, open it.