To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I am not a fan of the plastic waste but these control the amount my kids eat at a time. Yes I could control myself without so much waste but I'm a working Mom and am not home when the kids get home from school.