Cardboard storage box 20x20x20 inch large square boxes
20 inches wide, 20 inch long by 20 inches high, yes is a square box!
508 x 508 x 508 mm metric sizes for these export style storage and removal boxes.
Maybe too large for house removals, but that depends what you are moving.
Usually purchased by companies for transporting and distributing their goods
A strong double walled box.