The serving size is the whole freakin' point. If you were to consume 1 bag of the Soylent powder, or 5 bottles of the pre-mixed drink, you would have exactly 100% of your RDA for most macros and some micros (+/- some modest amount) for a 2000cal diet.

This breaks down easily into per-meal replacements especially for the powder. Half a bag is half a day's needs, and so on.

That is literally the whole reason Soylent exists. As far as I know, it's the only product that works that way at that price point.