Bests & Worsts Reviews from Amazon

The bag is good quality. Overall I am happy. To clarify a couple of questions other people asked, the bite valve is a "bite and pull" valve. You put it in your mouth, bite down gently to "hook" the valve with your teeth, and then while still biting down, gently pull the valve. It will pop open and fluid flows freely. It does NOT open just by biting down. Second question asked by others - despite all sorts of wrist gyrations, including having a second person help hold the bag, there is no way anyone is going to get 2.0 liters into this bag. We got 1.6 and that was it. There simply was no more room unless we wanted to risk popping the bag. With 1.6 liters in the bag, I challenge any one person to get this bag closed without accidentally dumping 100 ml or so out of the bag. The seller suggests holding the bag so that the opening is horizontal, and filling the bag. We did that using two people so that we had enough hands to keep the bag wide open, flat, and to prevent sagging while filling. We could still not get 2.0 liters into this bag. So I am giving this product a four-star rating not because there is anything wrong with the bag, there is nothing wrong and it is good quality, but because of the false advertising.