>> If I buy two identical 2 litre PET bottles of Sainsbury's Basic Lemonade, then empty
>> them so that they are both half-full. On one, I allow the bottle to flip
>> out to its original shape and screw the cap on; for the other, I squeeze
>> out the gas to make the volume above the liquid smaller - then I screw
>> the cap on.
This is the first time you have specified a bottle size. Make your mind up.
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