Hello there...

This is the multi-grip design concept. It was done a while back (2007) during my time with MKD, a design and engineering company that specialized in plastic packaging.

It's quite clear i guess, the solution was rather simple, creating a bottle with multiple and varied dimaeters, each in a certain angle, this ensured that the bottle would be ergonomically compatible with any hand size...
The purely functional approach resulted in a strange (in a good way) aesthetic.