They leak because they are built with an airtight leak-proof seal and secure latches. The crystal-clear lid and base of these clear food storage containers make it easy to see what s inside. They are stain and odor-resistant, which helps them stay looking like new. Rubbermaid food storage containers feature a spatter-free lid design, plus built-in vents that allow steam to escape so anyone can conveniently reheat food in the microwave without removing the lid.