I appreciate the small size and very light weight when empty.
The secure closure leaves me comfortable with this inside a backpack or bike bag.
It is much smaller, of course, than my insulated bottles with the same capacity.
I thought I'd have trouble in sub freezing and sub zero temperatures, but actually this works well in my kit: hot or room temp drink into this bottle, it slowly cools, and I drink it comfortably later--21 oz of liquid has a lot of thermal mass, it turns out. I'll often travel in the cold with two bottles--this uninsulated one, and an insulated one. That way, I have hot drinks available for several hours, drinking first from this uninsulated bottle, later from the insulated bottle. One must be careful not to let this bottle freeze when full--I've damaged bottles in the past if the bottle is full and it freezes solid.
Being titanium, I know I can warm the contents over a stove or fire, but I haven't done that yet.
Thank you Vargo!