Empty, it weighs between ninety and a hundred and forty grams, aluminum in the older bin installations and a grey resin in most newer ones, the resin quieter against the plastic bin wall by a noticeable margin, a difference confirmable with a scoop in each hand and the eyes closed, an experiment that draws a look from the stocking clerk and does not invite explanation. Forty-one greys are knowable by touch alone, and the scoop trades in the same vocabulary: its handle is molded with a shallow ridge exactly where the thumb wants to sit, worn smoother than the rest of the plastic within a season of use, and its bowl has a lip angled at perhaps fifteen degrees, enough to pour lentils without spilling and not quite enough for rice, which scatters if tipped too fast.
The sound is the part most people miss. Dragged along the bottom of a nearly empty bin, it produces a dry, climbing scrape, almost a grievance; dragged through a full one, the sound goes soft and low, muffled by the grain itself, and a practiced ear can judge a bin's fullness with the eyes shut, out of habit more than necessity. It is not a sophisticated instrument. It is, however, an honest one, calibrated by nothing but its own weight and the material it moves through, and no example of it has yet been found to lie about what is or is not still in the bin.