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.