Ah yes, the Sprite bottles from the 60’s. I’m not surprised considering our research methodology relies on the historical context of what’s around them. Although, the consumers we used were not alive in the 60’s and so they may be have gravitated to the structural elements from a different source.
It’s always a challenge designing a heavily commoditized material with production restrictions in place. I’m sure all the bottle designs out there have a couple “grandparents” floating around out there. 