FRIDGE COLD FOR HOURS: Lunch pack features SuperFoam insulation with a Therma-Flect radiant barrier interior that in combination with 2 Ice Walls keep your lunch, snacks, and drinks Fridge Cold and fresh for up to 6 hours or chilled for up to 12 hours*! LEAK PROOF LINING WITH MICROBAN PROTECTION: Ultra Safe leak proof** lining with Microban protection; Built-in protection helps prevent build-up of odors and stains; Makes lunch pack easier to clean after work, school or picnics; **zipper is not leak proof REUSABLE ICE PACKS: Includes two Ice Walls that fit into exterior pockets to maximize interior space; Pack and refrigerate lunch the night before, insert frozen Ice Walls the next day without opening the lunch box and letting out cold air VERSATILE DESIGN: Lunch pack is easy to carry horizontally, vertically, over the shoulder, by the handles, or attached to a backpack or bag; Perfect for taking lunch on the go EXPANDABLE DESIGN: Lunch box expands to nearly double capacity from 110 ounces to 220 ounces; Conveniently stores lunch, snacks, sandwiches, water bottles, and more