The snap-tight Culinary Essentials by Cambro 1218CCW135 Camwear Flat Food Box Lid won't come off during transportation. Features top molded-in rails for safer and more secure stacking. Lid is made of crystal clear, virtually unbreakable Camwear polycarbonate and withstands temperatures from -40°F to 210°F (-40°C to 99°C). Measures at 18 inches long by 12 inches wide.