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To use, collapse the Mini Lunch Bag flat and store it in the freezer overnight (12 hours). In the morning, the walls of the lunch box will be completely frozen and ready to chill food and drinks for hours. The Mini Lunch Bag features a top zip closure that locks in cool, dry air and a buckle handle easily clips onto totes, backpacks or strollers. This soft lunch bag is made from nontoxic poly canvas and has a food-safe, water-resistant lining. Simple care: wipe thoroughly or hand wash the interior and spot clean exterior; allow bag to dry completely before freezing. Not machine or dishwasher safe.