Quote:
Originally posted by gwilkins
That's what I was thinking
It would also mean less room for beer in the 'bottle' 
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Unless it is a bigger bottle with same inside volume. Then its brilliant.
Only one thing could make it more brilliant. A small bladder near the bottom of the bottle full of CO2 that is popped when you undo the bottle cap. Walla warm to icy cold when opening, and due to thermos vacum of bottle it could stay cold for up to an hour or two.