Bought this (800ml) and the smaller (600ml) with small neck. Decided to keep the larger one and return the smaller one. 600ml was fine too, but the hole made cleaning difficult. In addition, filling liquids becomes more difficult. The 800 model has a nice wide opening for cleaning and pouring liquids. None of these insulate hot liquids, and you need a neoprene sleeve just to keep them warm with hot liquids. The cover is loud, judging by the reviews of some. The threads are not smooth and scratch a lot when opening/closing. I am concerned that titanium shavings could potentially fall into the water, but I have not seen this in my water.
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