I love the durability of the fabric and complete lack of aftertaste. I have had zero leakage from the hose or mouthpiece. I also really like the mouthpiece. It does take some time to get use to biting it to open it and the flow is not super high. However, I like to sip water as I go so that's perfect. Plus the mouthpiece seals so well that you don't have to close the valve. My only big complaint is that there is no loop in the center to attach it to a pack that's built for a Camelbak or an Osprey bladder. There is a small opening in the plastic piece you use the lift the bladder. I rigged a piece of heavy gauge wire from Home Depot to make a loop I could attach inside my pack. Finally, a small nitpick, the lid should stay attached when you take it off so you can't drop it or lose it. I like that feature of my old Camelbak. Overall though, they nailed the three most important features in my book - hose, mouthpiece and durability.
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