180 pounds of dry concrete mix is a substantial amount of material that occupies 10.8 gal (40.8 L) of space. When poured into a loose pile, it measures 28.3 in (71.9 cm) wide and 11.9 in (30.2 cm) tall, which is about 2 times the size of a 5-gallon bucket.

Volume
10.8 gallons
10.8 gal (40.8 L)
about 2 times the size of a 5-gallon bucket
Dry concrete mix typically ranges 1.9–2.2 g/mL depending on how it's packed. A firmly packed scoop weighs more.