12-pack of legal-size cardboard boxes for filing, storing, or transporting items; medium-duty strength; white color; collapsible and reusable Made of C-flute corrugated cardboard; single-wall sides; double-wall bottom and ends for added reinforcement; rated 32 ECT (edge crush test) Double-wall lid when closed (its 2 end pieces are overlapped by 2 side pieces); 550-pound stacking strength