Do insulated bottles actually work?

[makoti]

Originally Posted by Veloo

The Bivo valves are also more complicated to allow flow like a straw so that's another turn off.

I like my valves simple and cleanable. Pull with your mouth/teeth to open. Knock it against your thigh to close.

That describes the Bivo, as well. They are a straw, and require a bit of cleaning, but they supply that bit. And they don't seem to leak