This bottle is 4.5 inches tall but only holds one ounce of liquid. You can see from the bottom that this bottle is almost all glass. Mold seams are on the diagonal
Yup most extracts usually have a simmilar shape to this, however I have seen these type of bottles used for medicine too.I agree on it being an extract, designed to make the bottle look as large as possible without actually containing very much of what would have been a pretty expensive product used in small amounts.