Bio-Plus Earth food containers, endorsed by the Green Restaurant Association, are leak resistant and perfectly suitable for all food types from hot to cold, wet to dry. One-piece design, no assembly or lid inventory. Retains heat and vents steam. Leak resistant, withstands sauces and gravies. Stackable. Cut resistant. Wide opening for easy food access. Microwaveable only for reheating. Moderate heat-lamp tolerance.