Lunch Tote Bags Boxes Features: 1.Made from 3.5mm thicker natural neoprene for better insulation 2.Strong double needle stitching,sturdy and durable 3.High quality zipper are more durable 4.More stretchy and expands to fit a variety of containers or foods 5.Easily folds flat even can be rolled up and takes up less space 6.High quality without fraud and high cost performance. 7.All of our neoprene lunch bags are tested by the CPSC-accepted testing laboratory ,and have the Children’s Product Certificate (CPC). Made from 3.5mm natural insulating neoprene, which can keep food cold (or warm) for up to 4 hours.Actual effect will be different depending on the content and outside temperatur,we recommend that you can put ice bags into your lunch bag. The natural neoprene is a very firm and stretchy material that allows the lunch tote to expand to fit a variety of foods, drinks and containers. It can fit about one thermos or water bottle and two upper ware containers with extra room for granola bars, cheese sticks, or fruit snacks. It was designed with a flat bottom which can easily sit upright. The lunch tote makes it easy to go gourmet at school, on work,on hospital or any time on-the-go. It's great for road trips, plane traveling or a picnic, it also can be used as a grocery bag, travel bag, ect.