Why do glass bottles have notches in the bottom?

Question

Why do glass bottles have notches in the bottom?

Answer 1

There are actually 2 reasons. The first is just like others have said; bottling machines. BUT the real reason, and more important, is this:

If you spill the liquid, the notches help prevent the liquid from creating a seal and slipping all over the place (think of hydroplaning and the tread on your tires).

Answer 2

I think it's to make the bottles more stable and to let them stand upright??

Answer 3

So that filling machines can hold them securely.

That's why!

.

Answer 4

Filling machines can hold them better that way. The cogs, etc hold them still better.

As a side-effect, they're also maybe more stable, and a little easier for you to grab hold of them sometimes (don't ask how I know, I  just do...I've been in that position).