One cubic foot of topsoil is a volume of 7.48 gal (28.3 L). It is about the size of a 5-gallon bucket and, when poured into a loose pile, measures 26.6 in (67.6 cm) wide and 9.32 in (23.7 cm) tall.

Volume
7.48 gallons
7.48 gal (28.3 L)
about the size of a 5-gallon bucket
Topsoil typically ranges 1–1.4 g/mL depending on how it's packed. A firmly packed scoop weighs more.