SmartLock system features a tight, audible click closure that helps ensure maximum food freshness. Wide temperature resilience range 20°F to 180°F enables placement in freezers and heated display cases. Smooth front panel makes sticker-labeling easy. Strong, rib-reinforced sides and back accommodate heavy items and provide enhanced crush resistance. Break-resistant hinge is flexible enough for easy closure and reliable enough for repeated openings and closings. 6in Sandwich. Food Container Type: Hinged Lid Container; Materials: Plastic; Food Container Material Type: Plastic; Capacity Volume: 20 oz.