It’s a little hard to tell from the photos, but the main part of the bottle is 110mm high, and the contents come up to 25mm, so 85mm is just empty wasted space.
I’d love to know why.
(And just for information, I know that most people don’t need to take vitamin supplements, but I’ve had surgery which limits my intake, so they’re prescribed.)
The size of different products will vary, eg the Vitamin E capsules can be much larger than the multivitamin tablets in your picture, so 200 of them might fill the container to a higher level. They also sell them in lots of 450, so the container would have quite a high tide mark.
So maybe it’s cheaper for them to standardise on a lower number of containers, even if they only utilize a portion of the internal space? On the other hand, maybe they want you to think (from the outside) that you are getting as good a deal as you would from their competitors?