Why do bottles of Visine have an angled corner at the bottom?

http://www.theonion.com/graphic/mesquite-bbq-visine-selling-poorly-outside-texas-8703

It serves no useful function, nor could it to be trademark protected: it's simply a marketing design, to distinguish it from other products. I know in the olden days Murine and Visine used to battle each other fiercely for market share, so it was important to be different. "Gets the Red Out" was Visine's grand volley in that war.


cov.com/files/Publication/f612e227-1865-4b89-bafc-36cae1e43a61/Presentation/PublicationAttachment/a0d94f1b-7be5-4bfe-b38e-38bf48e32cc3/oid63717.pdf no longer exists