Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
This is the first item I have ever had to return to Amazon. It doesn’t fit the thermos funtainer at all , the height of the mouthpiece is too small to fit the cap and the straw is too long for the bottle. Not happy at all as I desperately needed replacement straws.