Why are "Fiji" water bottles square? (It's not just marketing)?

Question

I know the answer and it makes sense but it is interesting none the less because those bottles don't fit in a car cup holder and I previously thought it was a stupid design for cup holders... After all Fiji water is sold in gas stations.

Answer 1

The bottles are square so more of them can fit in a box for shipping.  Saves money and materials.

Answer 2

maybe it makes them more unique and stable as well !