Originally Posted by kenny1
KenN - Is that because of the complexity of the bottle shape?
The two upper edges will need to be less pronounced otherwise the areas around there will warp due to uneven cooling, in extreme cases sharp edges like that can even shatter as the material cools and shrinks.
Actually, this bottle can be manufactured as long as the upper surface on the widest part of the bottle slops downwards (down and out). This is to facilitate the retraction of the mold.