Superior rigidity and crush strength. Thermal insulation that keeps hot food hot and cold food cold. Lightweight F and E flute material allows moisture vapor transmission to keep foods fresh and crisp, prevents soggy takeout and resists grease. Easy to load for fast operational efficiency. Secure latch locking lid functionality. Side and/or back venting that enables selective release of excess heat and steam from hot foods if needed. Medium material is 100% Post Consumer Recycled Content.