I seem to remember an IMR powder back in the late 80s and early 90s that was sold in a quantity less than 16 oz. Maybe as low as 8 oz. I don't remember which powder, since I was only loading .38/.357 and .44 Spl and Mag, so my only two powders were Unique and 296.
I think the container was the same physical size as the other powders, so at the time I just assumed that particular powder was bulkier.