A standard size is 9 3/8 inches long, 5 1/4 inches wide, and 2 3/8 inches tall (24 cm long, 13 cm wide, 6 cm tall.)
Some have an insert with slats or holes in it that sets in the bottom of the pan. The insert raises the meatloaf above the pan, allowing a space below for the fat to drain off into.
They tend to have a non-stick coating inside.
A regular bread loaf pan