SMARTLOCK® HINGED LID 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-LABELLING 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. ITS MADE UP OF PLASTIC AND ITS A HOAGIE SMALL CONTAINER. CAN KEEP 5″ SANDWICH.