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Hay is dried grass or legumes harvested for animal feed, packing very little weight into a large volume.
Loose hay has a bulk density of roughly 5 pounds per cubic foot (0.08 grams per milliliter), meaning most of its volume is trapped air. Because the stiff, dried plant stems tangle rather than pack tightly, hay takes up significantly more space than dense grains or feed pellets. A standard five-gallon bucket holds less than 3.5 pounds (1.6 kilograms) of loose hay, making it far lighter by volume than sawdust or garden soil.
From Wikipedia
Hay is grass, legumes, or other herbaceous plants that have been cut and dried to be stored for use as animal fodder, either for large grazing animals raised as livestock, such as cattle, horses, goats, and sheep, or for smaller domesticated animals such as rabbits and guinea pigs. Pigs can eat hay, but they do not digest it as efficiently as herbivores do.
Read more on Wikipedia →Text from Wikipedia’s “Hay” article, CC BY-SA 4.0.
1 on the site
One cup weighs
0.668 oz (18.9 g)
Quick answer
One US cup of loose hay weighs about 0.67 ounces (19 grams). That makes it exceptionally light for its size, weighing less than a typical slice of bread.
Typical figures, the same ones every comparison on the site uses; real ones vary.
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