Bran Flakes is a brand of cereal featured on a TV commercial that was only seen in the episode, "As Seen on TV." The cereal more than likely has bran in it, because of the word "Bran" in its name.
It is unknown what the food tastes like, but it is presumed that it is possibly for older people, and it is identical to normal bran.
The boxing is yellow, and has pictures of the food on it. The name of the cereal is written in all caps and in white with a light blue outline near the top of the box. Nutritional info and other info is on the right side of the box. For taste in "As Seen on TV," it is mentioned to have a bold new taste.
Bran Flakes is featured when Old Man Jenkins watches the cereal's commercial on TV. He mistakes SpongeBob for a "Bran Flakes" cereal box from the commercial, even saying "what a nice cereal box" when he meets SpongeBob.