25 gallons of topsoil is a pile of soil about the size of a wheelbarrow load. When poured into a loose pile, it is 3.32 ft (1.01 m) wide and 13.9 in (35.4 cm) tall.

Volume
25 gallons
25 gal (94.6 L)
about the size of a wheelbarrow load
Topsoil typically ranges 1–1.4 g/mL depending on how it's packed. A firmly packed scoop weighs more.