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.
When I opened this is had a very strong acrid smell that hit me in the back of the throat. I let it air out for several days, but some of the smell was still there. Not something I'd like to put into a backpack. I ordered a different brand insert at the same time which had no odor. I will just order the larger size of that.
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