To calculate the overall star rating and percentage breakdown by star, we don’t 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 bought 2 of these for my PCT thru hike to use alongside smart water bottles - one held up, the other started leaking after a month on trail. I really like how lightweight they are, which makes them great for stowing in your pack in case you need extra capacity. The threads fit the Sawyer Squeeze well, but the combination of the small mouth opening and the flexibility of the bladder can make it difficult to fill. For this reason, I really enjoy the ease of the CNOC 2L Vecto with the wide zip. It weighs a little more, but IMO it's worth it for the time you save trying to fill this thing. If you do decide to go with these though, cut the top off a Sawyer bag and use it as a scoop.