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.
Best straw bottle and loving it! Lightweight but good quality; able to withstand daily throwing by my 1-year-old. Easy to wash and no issues with mold (kept getting mold for pigeon sippy straw bottle). Recently started using a 2nd bottle for fresh milk at infant care (he rejects milk bottles) and he had no transition problem taking milk from it. Thumbs up!